William IV was King of the United Kingdom of Great Britain and Ireland from 26 June 1830 until his death in 1837. The third son of George III, William succeeded his elder brother George IV, becoming the last king and penultimate monarch of Britain's House of Hanover.

William served in the Royal Navy in his youth and was nicknamed the "Sailor King". In 1789, he was created Duke of Clarence and St Andrews. In 1827, he was appointed as Britain's first Lord High Admiral since 1709. As his two older brothers died without leaving legitimate issue, he inherited the throne when he was 64 years old. His reign saw several reforms: the poor law was updated, child labour restricted, slavery abolished in nearly all of the British Empire, and the British electoral system refashioned by the Reform Act 1832. He was the last monarch to appoint a prime minister contrary to the will of Parliament.

At the time of his death William had no surviving legitimate children. He was succeeded by his niece Victoria and in Hanover by his brother Ernest Augustus.

Charles Grey, 2nd Earl Grey, (13 March 1764 – 17 July 1845), known as Viscount Howick between 1806 and 1807, was a member of the Whig Party and was a long-time leader of multiple reform movements, most famously the Reform Act 1832. His government also saw the abolition of slavery in the British Empire, in which the government purchased slaves from their owners in 1833. Grey was a strong opponent of the foreign and domestic policies of William Pitt the Younger in the 1790s. In 1807, he resigned as foreign secretary to protest the King's uncompromising rejection of Catholic Emancipation. Grey finally resigned in 1834 over disagreements in his cabinet regarding Ireland, and retired from politics.

Earl Grey tea is named after him.

The Slavery Abolition Act abolished slavery in the British Empire. This Act expanded the jurisdiction of the Slave Trade Act 1807 which made the purchase or ownership of slaves illegal within the British Empire, with the exception "of the Territories in the Possession of the East India Co", Ceylon (Sri Lanka), & Saint Helena. The Act was repealed in 1997 as part of a review of English statute but later anti-slavery legislation remains

In 1832, a Royal Commission into the Poor Law recommended changes to the system of parish poor relief. Many of its recommendations were incorporated into the Poor Law Amendment Act of 1834.

This statute maintained outdoor relief (relief given outside a workhouse), but led to more central control of the system

The Workhouse originated in the Poor Law Act 1388 but mass unemployment after the Napoleonic Wars, & the introduction of technology to replace agricultural workers meant the established system was unsustainable. The Poor Law of 1834 discouraged the provision of relief to anyone who refused to enter a workhouse. Life in a workhouse was harsh but in the provision of free medical care & education for children inmates were advantaged over the general population

William Lamb, 2nd Viscount Melbourne, (15 March 1779 – 24 November 1848) was a British Whig statesman who served as Home Secretary (1830–1834) and Prime Minister (1834 and 1835–1841). He is best known for his intense and successful mentoring of Queen Victoria in the ways of politics, when she was between the ages of 18 and 21. Historians have concluded that Melbourne does not rank highly as a Prime Minister, for there were no great foreign wars or domestic issues to handle, he lacked major achievements, and he enunciated no grand principles. "But he was kind, honest and not self-seeking."

Melbourne was Prime Minister on two occasions. The first ended when he was dismissed by King William IV in 1834, the last British prime minister to be dismissed by a monarch. Six months later he was re-appointed and served for six years.

Arthur Wellesley, 1st Duke of Wellington, (1 May 1769 – 14 September 1852) was an Anglo-Irish soldier and Tory statesman who was one of the leading military and political figures of 19th-century Britain, serving twice as Prime Minister. His victory against Napoleon at the Battle of Waterloo in 1815 puts him in the first rank of Britain's military heroes.

This, his second term as PM, was a caretaker role until a new leader was found.

Sir Robert Peel, 2nd Baronet, (5 February 1788 – 2 July 1850) was a British statesman and Conservative Party politician who served twice as Prime Minister of the United Kingdom (1834–35 and 1841–46) and twice as Home Secretary (1822–27 and 1828–30). He is regarded as the father of modern British policing and as one of the founders of the modern Conservative Party.

His first administration was a minority government, dependent on Whig support and with Peel serving as his own Chancellor of the Exchequer. After only four months, his government collapsed and he served as Leader of the Opposition during the second government of the Viscount Melbourne (1835–1841).

William Lamb, 2nd Viscount Melbourne, (15 March 1779 – 24 November 1848) was a British Whig statesman who served as Home Secretary (1830–1834) and Prime Minister (1834 and 1835–1841). He is best known for his intense and successful mentoring of Queen Victoria in the ways of politics, when she was between the ages of 18 and 21. Historians have concluded that Melbourne does not rank highly as a Prime Minister, for there were no great foreign wars or domestic issues to handle, he lacked major achievements, and he enunciated no grand principles. "But he was kind, honest and not self-seeking."

Melbourne was Prime Minister on two occasions. The first ended when he was dismissed by King William IV in 1834, the last British prime minister to be dismissed by a monarch. Six months later he was re-appointed and served for six years.

Victoria was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until her death. On 1 May 1876, she adopted the additional title of Empress of India.

Victoria inherited the throne at the age of 18, after her father's three elder brothers had all died leaving no surviving legitimate children. She became a national icon who was identified with strict standards of personal morality. Victoria married her first cousin Prince Albert. After his death in 1861, Victoria plunged into deep mourning and avoided public appearances. As a result, republicanism temporarily gained strength but in the latter half of her reign, her popularity recovered. Her Golden and Diamond Jubilees were times of public celebration.

Before 1837, there was no national system of civil registration in England and Wales. Baptisms, marriages and burials were recorded in parish registers maintained by Church of England clergy. With the increase in nonconformity baptisms, marriages and burials were going unrecorded. The Parochial Registers Act of 1812 did not recognise the church registers of Nonconformists. Eventually, this led to the 1836 Registration and Marriage Acts

More correctly known as the Palace of Westminster, the Houses of Parliament are the meeting places of the Houses of Commons and Lords. The name is from the neighbouring Westminster Abbey.While the present buildings make look as though they date from the Gothic Period of the 14th and 15th Centuries, they were built between 1840 and 1870 following the 1834 fire

British Migration to New Zealand: In early 19th C, Britain conditions were such that millions set off for the New World. By 1839 there were only 2,000 immigrants in New Zealand, by 1852, 28,000. The decisive moment for this change was 1840 when the Treaty of Waitangi was signed. This established British authority in European eyes, and gave British immigrants legal rights as citizens. The treaty helped ensure that for 100+ years, most immigrants would come from the UK

Sir Robert Peel, 2nd Baronet, (5 February 1788 – 2 July 1850) was a British statesman and Conservative Party politician who served twice as Prime Minister of the United Kingdom (1834–35 and 1841–46) and twice as Home Secretary (1822–27 and 1828–30). He is regarded as the father of modern British policing and as one of the founders of the modern Conservative Party.

His second government ruled for five years. He cut tariffs to stimulate trade; to replace the lost revenue he pushed through a 3% income tax. He played a central role in making free trade a reality and set up a modern banking system.

Following the end of the Napoleonic War in 1815, the public mood of compliance with income tax rapidly evaporated. The government wanted to retain it to help reduce the National Debthowever, strong public opposition to the tax was demonstrated by landowners, merchants, manufacturers, bankers, and tradesmen. On 18 March 1816, the government was narrowly defeated on the issue and was forced to abandon it.

By the early 1840s business opinion had moved towards 'free trade' and the removal of high protective duties on imports and exports. Sir Robert Peel, the Prime Minister, was keen to facilitate this thinking. In 1842, therefore, he re-introduced income tax at 7d in the pound on incomes over £150. This allowed him to remove import and export duties on more than 700 items.

Sir John Bennet Lawes, 1st Baronet, FRS (28 December 1814 – 31 August 1900) was an English entrepreneur and agricultural scientist. He founded an experimental farm at his home at Rothamsted Manor that eventually became the Rothamsted Experimental Station, where he developed and, in 1842, patented a superphosphate that would mark the beginnings of the chemical fertilizer industry

SS Great Britain is a museum ship and former passenger steamship, and was advanced for her time. She was the longest passenger ship in the world from 1845 to 1854. She was designed by Isambard Kingdom Brunel (1806–1859), for the Great Western Steamship Company's transatlantic service between Bristol and New York. While other ships had been built of iron or equipped with a screw propeller, the Great Britain was the first to combine these features in a large ocean-going ship. She was the first iron steamer to cross the Atlantic, which she did in 1845, in 14 days.

John Russell, 1st Earl Russell, (18 August 1792 – 28 May 1878), known by his courtesy title Lord John Russell before 1861, was a leading Whig and Liberal politician who served as Prime Minister of the United Kingdom on two occasions during the early Victorian era.

He headed a government that failed to deal with the Irish Potato Famine, a disaster which saw the loss of a quarter of that country's population. It has been said that his ministry of 1846 to 1852 was the ruin of the Whig party: it never composed a Government again, and his ministry of 1865 to 1866 was very nearly the ruin of the Liberal Party also.

Alexander Graham Bell was a Scottish-born scientist, inventor, engineer, and innovator who is credited with inventing and patenting the first practical telephone. He also founded the American Telephone and Telegraph Company (AT&T) in 1885.

Bell's father, grandfather, and brother had all been associated with work on elocution and speech and both his mother and wife were deaf, profoundly influencing Bell's life's work. His research on hearing and speech further led him to experiment with hearing devices which eventually culminated in Bell being awarded the first U.S. patent for the telephone in 1876. Bell considered his invention an intrusion on his real work as a scientist and refused to have a telephone in his study

The Great Exhibition of the Works of Industry of All Nations or The Great Exhibition, sometimes referred to as the Crystal Palace Exhibition in reference to the temporary structure in which it was held, was an international exhibition that took place in Hyde Park, London, from 1 May to 15 October 1851. It was the first in a series of World's Fairs, exhibitions of culture and industry that became popular in the 19th century, and it was a much anticipated event. It was organized by Henry Cole and Prince Albert, husband of the reigning monarch, Queen Victoria. It was attended by famous people of the time,

Edward George Geoffrey Smith-Stanley, 14th Earl of Derby, (29 March 1799 – 23 October 1869) was a British statesman, three-time Prime Minister of the United Kingdom and, to date, the longest-serving leader of the Conservative Party. He was known before 1834 as Edward Stanley, and from 1834 to 1851 as Lord Stanley. He is one of only four British prime ministers to have three or more separate periods in office. However, his ministries all lasted less than two years and totalled three years and 280 days.

Derby formed a minority government in February 1852 following the collapse of Lord John Russell's Whig Government. When the aged Duke of Wellington, by then very deaf, heard the list of inexperienced cabinet ministers being read aloud in the House of Lords, he gave the government its nickname by shouting "Who? Who?" From then this government would be known as the "Who, Who" government

George Hamilton-Gordon, 4th Earl of Aberdeen, (28 January 1784 – 14 December 1860), was a British statesman, diplomat and landowner, successively a Tory, Conservative and Peelite politician, who served as Prime Minister from 1852 until 1855 in a coalition between the Whigs and Peelites, with Radical and Irish support.

The Aberdeen ministry was filled with powerful and talented politicians, whom Aberdeen was largely unable to control and direct. Despite trying to avoid this happening, it took Britain into the Crimean War, and fell when its conduct became unpopular, after which Aberdeen retired from politics.

The Crimean War was fought by an alliance of Britain, France, Turkey and Sardinia against Russian expansion into the Danube region (modern day Romania). One battle - The Battle of Balaclava - became famous for the Charge of the Light Brigade

The Crimean war also saw the rise to prominence of Florence Nightingale.

Henry John Temple, 3rd Viscount Palmerston, (20 October 1784 – 18 October 1865) was a British statesman who served twice as Prime Minister in the mid-19th century. Palmerston dominated British foreign policy during the period 1830 to 1865, when Britain was at the height of her imperial power. He held office almost continuously from 1807 until his death in 1865. He began his parliamentary career as a Tory, defected to the Whigs in 1830, and became the first Prime Minister of the newly formed Liberal Party in 1859.

He had two periods in office, 1855–1858 and 1859–1865, before his death at the age of 80 years, a few months subsequent to victory in a general election in which he had achieved an increased majority. He remains, to date, the last Prime Minister to die in office.

Edward George Geoffrey Smith-Stanley, 14th Earl of Derby, (29 March 1799 – 23 October 1869) was a British statesman, three-time Prime Minister of the United Kingdom and, to date, the longest-serving leader of the Conservative Party. He was known before 1834 as Edward Stanley, and from 1834 to 1851 as Lord Stanley. He is one of only four British prime ministers to have three or more separate periods in office. However, his ministries all lasted less than two years and totalled three years and 280 days.

Among the notable achievements of this, his second administration, was the end of the British East India Company following the Sepoy Mutiny, which brought India under direct British control for the first time. Once again the government was short-lived, resigning after only one year, having narrowly lost a vote of no-confidence

Sir Arthur Conan Doyle was Scottish author who created the legendary character, 'Sherlock Holmes.' He wrote over 60 'Sherlock Holmes' stories and many non-fiction, works of fantasy, science-fiction, poetry and historical novels. He went to medical school and set up his own practice. His medical career did not succeed and he began writing while he waited for patients. The rest is history.

Henry John Temple, 3rd Viscount Palmerston, (20 October 1784 – 18 October 1865) was a British statesman who served twice as Prime Minister in the mid-19th century. Palmerston dominated British foreign policy during the period 1830 to 1865, when Britain was at the height of her imperial power. He held office almost continuously from 1807 until his death in 1865. He began his parliamentary career as a Tory, defected to the Whigs in 1830, and became the first Prime Minister of the newly formed Liberal Party in 1859.

He had two periods in office, 1855–1858 and 1859–1865, before his death at the age of 80 years, a few months subsequent to victory in a general election in which he had achieved an increased majority. He remains, to date, the last Prime Minister to die in office.

On the Origin of Species (or more completely, On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life), published on 24 November 1859, is a work of scientific literature by Charles Darwin which is considered to be the foundation of evolutionary biology. Darwin's book introduced the scientific theory that populations evolve over the course of generations through a process of natural selection. It presented a body of evidence that the diversity of life arose by common descent through a branching pattern of evolution. Darwin included evidence that he had gathered on the Beagle expedition in the 1830s and his subsequent findings from research, correspondence, and experimentation.

The history of the London Underground began with the construction of the Metropolitan Railway, the world's first underground railway which opened in 1863 using gas-lit wooden carriages hauled by steam locomotives. The Metropolitan eventually extended more than 50 miles from Baker Street, London. By 1907 the District and Metropolitan Railways had electrified the underground sections of their lines.

John Russell, 1st Earl Russell, (18 August 1792 – 28 May 1878), known by his courtesy title Lord John Russell before 1861, was a leading Whig and Liberal politician who served as Prime Minister of the United Kingdom on two occasions during the early Victorian era.

When Palmerston suddenly died in late 1865, Russell again became Prime Minister. His second premiership was short and frustrating, and Russell failed in his great ambition of expanding the franchise, a task that would be left to his Conservative successors, Derby and Benjamin Disraeli. In 1866, party disunity again brought down his government.

Edward George Geoffrey Smith-Stanley, 14th Earl of Derby, (29 March 1799 – 23 October 1869) was a British statesman, three-time Prime Minister of the United Kingdom and, to date, the longest-serving leader of the Conservative Party. He was known before 1834 as Edward Stanley, and from 1834 to 1851 as Lord Stanley. He is one of only four British prime ministers to have three or more separate periods in office. However, his ministries all lasted less than two years and totalled three years and 280 days.

Derby returned to power for the third and last time in 1866. This administration was particularly notable for the passage of the Reform Act 1867, which greatly expanded the suffrage but which provoked the resignation of three cabinet ministers including the Secretary for India and three-time future Prime Minister, Lord Cranborne (later Lord Salisbury).

Marie Skłodowska Curie; born Maria Salomea Skłodowska 7 November 1867 – 4 July 1934) was a Polish and naturalized-French physicist and chemist who conducted pioneering research on radioactivity. She was the first woman to win a Nobel Prize, the first person and only woman to win twice, and the only person to win a Nobel Prize in two different sciences. She was part of the Curie family legacy of five Nobel Prizes. She was also the first woman to become a professor at the University of Paris, and in 1995 became the first woman to be entombed on her own merits in the Panthéon in Paris.

She was born in Warsaw, in what was then the Kingdom of Poland, part of the Russian Empire. She studied at Warsaw's clandestine Flying University and began her practical scientific training in Warsaw. In 1891, aged 24, she followed her older sister Bronisława to study in Paris, where she earned her higher degrees and conducted her subsequent scientific work. She shared the 1903 Nobel Prize in Physics with her husband Pierre Curie and physicist Henri Becquerel. She won the 1911 Nobel Prize in Chemistry.

Benjamin Disraeli, 1st Earl of Beaconsfield, (21 December 1804 – 19 April 1881) was a British statesman who twice served as Prime Minister of the United Kingdom.

During his first term of office, the Conservatives remained a minority in the House of Commons and the passage of the Reform Bill required the calling of a new election once the new voting register had been compiled. Disraeli's term as Prime Minister, which began in February 1868, would therefore be short.

William Ewart Gladstone (29 December 1809 – 19 May 1898) was a British statesman and Liberal Party politician. In a career lasting over sixty years, he served for twelve years as Prime Minister of the United Kingdom, spread over four terms beginning in 1868 and ending in 1894.

Many reforms were passed during his first ministry, including the disestablishment of the Church of Ireland and the introduction of secret voting. After electoral defeat in 1874, Gladstone resigned as leader of the Liberal Party.

The 1870 Education Act stands as the very first piece of legislation to deal specifically with the provision of education in Britain. Most importantly, it demonstrated a commitment to provision on a national scale.

The Act allowed voluntary schools to carry on unchanged, but established a system of 'school boards' to build and manage schools in areas where they were needed. The boards were locally elected bodies which drew their funding from the local rates. Unlike the voluntary schools, religious teaching in the board schools was to be 'non-denominational'. A separate Act extended similar provisions to Scotland in 1872.

Ernest Rutherford was a New Zealand physicist known as the father of nuclear physics.

He received the Nobel Prize in Chemistry in 1908 “for his investigations into the disintegration of the elements & the chemistry of radioactive substances.” He identified & named the Alpha & Beta

Benjamin Disraeli, 1st Earl of Beaconsfield, (21 December 1804 – 19 April 1881) was a British statesman who twice served as Prime Minister of the United Kingdom.

Disraeli's new government enacted many reforms, including: - the Artisans' and Labourers' Dwellings Improvement Act 1875, which made inexpensive loans available to towns and cities to construct working-class housing. - the Public Health Act 1875, modernising sanitary codes through the nation, - the Sale of Food and Drugs Act (1875) - the Education Act (1876). - the Factory Act meant to protect workers, - the Conspiracy, and Protection of Property Act 1875, which allowed peaceful picketing - the Employers and Workmen Act (1875) to enable workers to sue employers in the civil courts if they broke legal contracts.

As a result of these social reforms the Liberal-Labour MP Alexander Macdonald said, "The Conservative party have done more for the working classes in five years than the Liberals have in fifty."

"Mr. Watson — Come here — I want to see you" were the first intelligible words spoken over the telephone, as recorded in Bell's Journal entry (10 March 1876). These are often misquoted as "Mr. Watson, come here, I want you." Watson later recounted that Bell had spilled battery acid and had called for him over the phone with these words, but this may have been in a separate incident.

Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist who developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics). His work is also known for its influence on the philosophy of science.

He is best known to the general public for his mass–energy equivalence formula E = mc2, which has been dubbed "the world's most famous equation". He received the 1921 Nobel Prize in Physics "for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect", a pivotal step in the development of quantum theory.

William Ewart Gladstone (29 December 1809 – 19 May 1898) was a British statesman and Liberal Party politician. In a career lasting over sixty years, he served for twelve years as Prime Minister of the United Kingdom, spread over four terms beginning in 1868 and ending in 1894.

Historians have debated the wisdom of Gladstone's foreign-policy during his second ministry. Paul Hayes says it "provides one of the most intriguing and perplexing tales of muddle and incompetence in foreign affairs, unsurpassed in modern political history until the days of Grey and, later, Neville Chamberlain."

Sir Alexander Fleming (6 August 1881 – 11 March 1955) was a Scottish physician, microbiologist, and pharmacologist. His best-known discoveries are the enzyme lysozyme in 1923 and the world's first antibiotic substance benzylpenicillin (Penicillin G) from the mould Penicillium notatum in 1928, for which he shared the Nobel Prize in Physiology or Medicine in 1945 with Howard Florey and Ernst Boris Chain. He wrote many articles on bacteriology, immunology, and chemotherapy.

A prime meridian, based at the Royal Observatory, Greenwich, in London was established by Sir George Airy in 1851. By 1884, over two-thirds of all ships and tonnage used it as the reference meridian on their charts and maps. In October of that year, at the behest of US President Chester A. Arthur, 41 delegates from 25 nations met in Washington, D.C., United States, for the International Meridian Conference. This conference selected the meridian passing through Greenwich as the official prime meridian due to its popularity. However, France abstained from the vote, and French maps continued to use the Paris meridian for several decades.

Robert Arthur Talbot Gascoyne-Cecil, 3rd Marquess of Salisbury, (3 February 1830 – 22 August 1903), styled Lord Robert Cecil before 1865 and Viscount Cranborne from June 1865 until April 1868, was a British statesman and Conservative Party politician, serving as Prime Minister three times for a total of over thirteen years. He was the last Prime Minister to head his full administration from the House of Lords.

He became Prime Minister of a minority administration from 1885 to 1886. In the November 1883 issue of National Review Salisbury wrote an article titled "Labourers' and Artisans' Dwellings" in which he argued that the poor conditions of working class housing were injurious to morality and health

William Ewart Gladstone (29 December 1809 – 19 May 1898) was a British statesman and Liberal Party politician. In a career lasting over sixty years, he served for twelve years as Prime Minister of the United Kingdom, spread over four terms beginning in 1868 and ending in 1894.

During this administration he first introduced his Home Rule Bill for Ireland. The issue split the Liberal Party (a breakaway group went on to create the Liberal Unionist party) and the bill was thrown out on the second reading, ending his government after only a few months and inaugurating another headed by Lord Salisbury.

Robert Arthur Talbot Gascoyne-Cecil, 3rd Marquess of Salisbury, (3 February 1830 – 22 August 1903), styled Lord Robert Cecil before 1865 and Viscount Cranborne from June 1865 until April 1868, was a British statesman and Conservative Party politician, serving as Prime Minister three times for a total of over thirteen years. He was the last Prime Minister to head his full administration from the House of Lords.

In 1889 Salisbury set up the London County Council and then in 1890 allowed it to build houses. However, he came to regret this, saying in November 1894 that the LCC, "is the place where collectivist and socialistic experiments are tried. It is the place where a new revolutionary spirit finds its instruments and collects its arms".

John Logie Baird (13 August 1888 – 14 June 1946) was a Scottish engineer, innovator, one of the inventors of the mechanical television, demonstrating the first working television system on 26 January 1926, and inventor of both the first publicly demonstrated colour television system, and the first purely electronic colour television picture tube.

In 1928 the Baird Television Development Company achieved the first transatlantic television transmission. Baird's early technological successes and his role in the practical introduction of broadcast television for home entertainment have earned him a prominent place in television's history.

Sir James Chadwick was an English physicist. When his university Professor, Ernest Rutherford became the Director of Research at Cavendish Lab, he invited Chadwick to join him. While there, he discovered the neutron, for which he won the 1935 Nobel Prize in Physics. It led to the development of the atomic bomb. He was distressed that his discovery had been used to kill many innocent people

Ellis Island, in Upper New York Bay, was the gateway for over 12 million immigrants to the U.S. as the United States' busiest immigrant inspection station for over 60 years from 1892 until 1954. Ellis Island was opened January 1, 1892. The island was greatly expanded with land reclamation between 1892 and 1934. Before that, the much smaller original island was the site of Fort Gibson and later a naval magazine.

The island was made part of the Statue of Liberty National Monument in 1965 and has hosted a museum of immigration since 1990. "As a visitor to this place, you stand in awe. It has the aura of an ancient cathedral, redolent with the millions who passed through these doors."

William Ewart Gladstone (29 December 1809 – 19 May 1898) was a British statesman and Liberal Party politician. In a career lasting over sixty years, he served for twelve years as Prime Minister of the United Kingdom, spread over four terms beginning in 1868 and ending in 1894.

The general election of 1892 resulted in a minority Liberal government with Gladstone as Prime Minister. The electoral address had promised Irish Home Rule and the disestablishment of the Scottish and Welsh Churches.[118] In February 1893 he introduced the Second Home Rule Bill, which was passed in the Commons at second reading on 21 April by 43 votes and third reading on 1 September by 34 votes. The House of Lords defeated the bill by voting against by 419 votes to 41 on 8 September.

London’s iconic Tower Bridge opens. The bridge’s twin towers, high-level walkways and Victorian engine rooms now form part of the Tower Bridge Exhibition.

Tower Bridge was built to ease road traffic while maintaining river access to the busy Pool of London docks. Built with giant moveable roadways that lift up for passing ships, it is to this day considered an engineering marvel and beyond being one of London’s favourite icons, it is arguably one of the most famous and instantly recognisable structures in the entire world.

Archibald Philip Primrose, 5th Earl of Rosebery, 1st Earl of Midlothian, (7 May 1847 – 21 May 1929) was a British Liberal politician who served as Prime Minister of the United Kingdom from March 1894 to June 1895.

Rosebery's government was largely unsuccessful, as in the Armenian crisis of 1895–96. He spoke out for a strongly pro-Armenian and anti-Turkish policy. Gladstone, a prime minister in retirement, called on Britain to intervene alone. The added pressure weakened Rosebery.His designs in foreign policy, such as expansion of the fleet, were defeated by disagreements within the Liberal Party. He angered all the European powers.

Robert Arthur Talbot Gascoyne-Cecil, 3rd Marquess of Salisbury, (3 February 1830 – 22 August 1903), styled Lord Robert Cecil before 1865 and Viscount Cranborne from June 1865 until April 1868, was a British statesman and Conservative Party politician, serving as Prime Minister three times for a total of over thirteen years. He was the last Prime Minister to head his full administration from the House of Lords.

Among the important events of his premierships was the Scramble for Africa, culminating in the Fashoda Incident which escalated tensions with France, and the long, brutal and unpopular Second Boer War in South Africa.

Sir John Douglas Cockcroft was a British physicist who shared the 1951 Nobel Prize in Physics with Ernest Walton for their work on splitting the atom. His university studies were cut short by WWI. Afterwards he resumed his studies and on graduating he worked with Rutherford in the Cavendish Labs. He collaborated with Ernest Walton and their research was instrumental in the development of nuclear power.

The Spanish–American War was fought between the United States and Spain in 1898. Hostilities began in the aftermath of the internal explosion of USS Maine in Havana Harbor in Cuba, leading to U.S. intervention in the Cuban War of Independence. U.S. acquisition of Spain's Pacific possessions led to its involvement in the Philippine Revolution and ultimately in the Philippine–American War.

The result was the 1898 Treaty of Paris, negotiated on terms favorable to the U.S. which allowed it temporary control of Cuba and ceded ownership of Puerto Rico, Guam, and the Philippine islands. The cession of the Philippines involved payment of $20 million ($602,320,000 today) to Spain by the U.S. to cover infrastructure owned by Spain.

The Philippine–American War, was an armed conflict between the First Philippine Republic and the United States that lasted from February 4, 1899, to July 2, 1902. While Filipino nationalists viewed the conflict as a continuation of the struggle for independence that began in 1896 with the Philippine Revolution, the U.S. government regarded it as an insurrection. The conflict arose when the First Philippine Republic objected to the terms of the Treaty of Paris under which the United States took possession of the Philippines from Spain, ending the short Spanish–American War.

The war, and especially the following occupation by the U.S., changed the culture of the islands, leading to the disestablishment of the Catholic Church in the Philippines as a state religion, and the introduction of English to the islands as the primary language of government, education, business, industry, and, in future decades, among upper-class families and educated individuals.

The Boxer Rebellion was an anti-foreign, anti-colonial, and anti-Christian uprising that took place in China between 1899 and 1901, toward the end of the Qing dynasty. They were motivated by proto-nationalist sentiments and by opposition to Western colonialism and the Christian missionary activity that was associated with it.

The Boxer Protocol of 7 September 1901 provided for the execution of government officials who had supported the Boxers, provisions for foreign troops to be stationed in Beijing, and 450 million taels of silver—approximately $10 billion at 2018 silver prices and more than the government's annual tax revenue—to be paid as indemnity over the course of the next thirty-nine years to the eight nations involved. The Empress Dowager then sponsored a set of institutional and fiscal changes in a failed attempt to save the dynasty.

Fought by Britain and her Empire against the descendants of the Dutch settlers (Boers) in the Transvaal region of South Africa, the Second Boer War highlighted the limitations of 19th C military methods, employing for the first time modern automatic weapons and high explosives to decimate the enemy

Edward VII was King of the United Kingdom of Great Britain and Ireland and Emperor of India from 22 January 1901 until his death in 1910. The eldest son of Queen Victoria and Prince Albert, Edward was related to royalty throughout Europe. During his mother's long reign he was excluded from political power, and personified the fashionable, leisured elite. Despite public approval his reputation as a playboy prince soured his relationship with his mother.

As king, Edward fostered good relations between Britain and other European countries, especially France, for which he was popularly called "Peacemaker", but his relationship with his nephew, the German Emperor Wilhelm II, was poor. The Edwardian era, which covered Edward's reign and was named after him, coincided with the start of a new century and heralded significant changes in technology and society, including steam turbine propulsion and the rise of socialism

Arthur James Balfour, 1st Earl of Balfour, (25 July 1848 – 19 March 1930) was a British statesman and Conservative Party politician who served as Prime Minister of the United Kingdom from 1902 to 1905.

He oversaw reform of British defence policy and secured the Entente Cordiale with France, leaving Germany in the cold. Resignations from the Cabinet over tariffs left his party divided. He also suffered from public anger at the later stages of the Boer war and the importation of Chinese labour to South Africa.

Paul Dirac was an English theoretical physicist and one of the pioneers in quantum mechanics and quantum electrodynamics. He proposed the existence of anti-matter purely on the basis of his mathematical logic. The winner of several prestigious awards including the 1933 Nobel Prize for physics which he shared with Erwin Schrödinger, he turned down a knighthood as he did not want to be addressed by his first name.

Sir Henry Campbell-Bannerman (7 September 1836 – 22 April 1908) was a British statesman and Liberal Party politician who served as Prime Minister of the United Kingdom from 1905 to 1908. He was the first First Lord of the Treasury to be officially called "Prime Minister", the term only coming into official usage five days after he took office.

When Arthur Balfour resigned as Prime Minister, Edward VII invited Campbell-Bannerman to form a minority government as the first Liberal Prime Minister of the 20th century. At 69, he was the oldest person to become Prime Minister for the first time in the 20th century. He almost immediately dissolved Parliament and called a general election.

Air Commodore Sir Frank Whittle, (1 June 1907 – 9 August 1996) was a British Royal Air Force air officer. He is credited with single-handedly inventing the turbojet engine. A patent was submitted by Maxime Guillaume in 1921 for a similar invention; however, this was technically unfeasible at the time. Whittle's jet engines were developed some years earlier than those of Germany's Hans von Ohain who was the designer of the first operational turbojet engine.

Herbert Henry Asquith, 1st Earl of Oxford and Asquith, (12 September 1852 – 15 February 1928), generally known as H. H. Asquith, was a British statesman and Liberal Party politician who served as Prime Minister of the United Kingdom from 1908 to 1916.

He was the last prime minister to lead a majority Liberal government. He played a central role in the design and passage of major liberal legislation and a reduction of the power of the House of Lords. In August 1914, Asquith took Great Britain and the British Empire into the First World War. In 1915 his government was vigorously attacked for the shortage of munitions and the failure at Gallipoli. He formed a coalition government with the other parties but failed to satisfy critics. He was forced to resign in December 1916 and never regained power.

George V's reign saw the rise of socialism, communism, fascism, Irish republicanism, and the Indian independence movement, all of which radically changed the political landscape. The Parliament Act 1911 established the supremacy of the elected British House of Commons over the unelected House of Lords. As a result of the First World War (1914–1918), the empires of his first cousins Tsar Nicholas II of Russia and Kaiser Wilhelm II of Germany fell, while the British Empire expanded to its greatest effective extent.

In 1917, George became the first monarch of the House of Windsor, which he renamed from the House of Saxe-Coburg and Gotha as a result of anti-German public sentiment. In 1924 he appointed the first Labour ministry and in 1931 the Statute of Westminster recognised the dominions of the Empire as separate, independent states within the Commonwealth of Nations.

RMS Titanic sank in the early morning of 15 Apr 1912, 4 days into its maiden voyage from Southampton to New York. The largest liner in service at the time, her sinking killed over 1,500 people, one of the deadliest peacetime maritime disasters in history. The disaster caused widespread outrage over the lack of lifeboats, lax regulations, and unequal treatment of the 3 passenger classes during evacuation

Computers owe their existence to British mathematician, Alan Turing. A child prodigy, he went on to pursue his PhD at Princeton University. He was an important member of a group of code-breakers in the Government Code and Cypher School in Bletchley Park and was given the daunting task of deciphering the ever-changing German codes sent by Enigma. He and his team of code-breakers were successful. Despite his part in ensuring the defeat of Germany he was prosecuted for his homosexuality, and committed suicide. In 2009 the British government issued a public apology for the way he was treated and in 2013 he was posthumously pardoned.

World War I (often abbreviated as WWI or WW1), also known as the First World War or the Great War, was a global war originating in Europe. Contemporaneously described as "the war to end all wars", it led to the mobilisation of more than 70 million military personnel, including 60 million Europeans, making it one of the largest wars in history. It was also one of the deadliest conflicts in history; an estimated nine million combatants and seven million civilians died as a direct result of the war, while resulting genocides and the 1918 influenza pandemic caused another 50 to 100 million deaths worldwide.

The Sinking of RMS Lusitania occurred on Friday, 7 May 1915 during WWI, as Germany waged submarine warfare against the UK which had implemented a naval blockade of Germany. The ship was torpedoed by a U-boat and sank in 18 minutes, killing 1,198 and leaving 761 survivors. The sinking turned public opinion in many countries against Germany, and contributed to the American entry into WWI

Born in New Zealand, Maurice Wilkins was a biophysicist awarded the Nobel Prize in Physiology or Medicine. He worked in the Manhattan project but lost interest in nuclear weapons and changed to biophysics. He and Rosalind Franklin provided the secondary research to the double helix theory. He shared the Nobel Prize with Watson and Crick as Franklin died in 1958.

The Easter Rising was an armed insurrection in Ireland during Easter, launched by Irish republicans to end British rule in Ireland. 485 people were killed, over 2,600 wounded. Many of the civilians were killed as a result of the British using artillery and heavy machine guns, or mistaking civilians for rebels. Others were caught in the crossfire in a crowded city. It left parts of Dublin in ruins

Francis Crick was an English molecular biologist, biophysicist, and neuroscientist. He is the co-discoverer of the structure of the DNA molecule. He, along with Watson and Maurice Wilkins were jointly awarded the 1962 Nobel Prize for Physiology or Medicine ‘for their discoveries concerning the molecular structure of nucleic acids, the Double Helix and its significance for information transfer in living material’

David Lloyd George, 1st Earl Lloyd-George of Dwyfor, (17 January 1863 – 26 March 1945) was a British statesman and Liberal Party politician. He was the final Liberal to serve as Prime Minister of the United Kingdom.

As Chancellor of the Exchequer (1908–1915) during H. H. Asquith's tenure as Prime Minister, Lloyd George was a key figure in the introduction of many reforms which laid the foundations of the modern welfare state. His most important role came as the highly energetic Prime Minister of the Wartime Coalition Government (1916–22), during and immediately after the First World War. He was a major player at the Paris Peace Conference of 1919 that reordered Europe after the defeat of the Central Powers.

The Zimmermann Telegram (or Zimmermann Note or Zimmerman Cable) was a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico. In the event that the United States entered World War I against Germany, Mexico would recover Texas, Arizona and New Mexico. The telegram was intercepted and decoded by British intelligence. Revelation of the contents enraged Americans, especially after German Foreign Secretary Arthur Zimmermann publicly admitted the telegram was genuine on March 3, and helped generate support for the United States declaration of war on Germany in April. The decryption was described as the most significant intelligence triumph for Britain during World War I, and one of the earliest occasions on which a piece of signal intelligence influenced world events.

As WWI moved to its end the world was swept with a pandemic of epic proportions, killing more people than the fighting. It was called Spanish Flu because it only became widely reported when it reached neutral Spain, press censorship having suppressed news of it elsewhere. One theory is that it was brought to Europe by US Troops. patient zero having been traced to a military training camp in the United States

Rosalind Franklin was a renowned English chemist who did pioneering work in X-ray crystallography. Her most important discovery was the structure of DNA molecule. Working with Maurice Wilkins and a doctorate student Raymond Gosling, she was able to correctly assess the structure of DNA. Her theory that DNA consists of two helical structures was later confirmed by scientists James Watson and Francis Crick

Andrew Bonar Law (16 September 1858 – 30 October 1923), commonly called Bonar Law was a British Conservative politician who served as Prime Minister of the United Kingdom from 1922 to 1923

Bonar Law was the shortest-serving PM of the 20th century. He is often referred to as "the unknown Prime Minister", not least because of a biography of that title by Robert Blake; the name comes from a remark by Asquith at Bonar Law's funeral, that they were burying the Unknown Prime Minister next to the Tomb of the Unknown Soldier. Sir Steven Runciman is reported to have said that he had known all British Prime Ministers in his lifetime, except Bonar Law whom no one knew.

Stanley Baldwin, 1st Earl Baldwin of Bewdley, (3 August 1867 – 14 December 1947) was a British statesman and Conservative Party politician who dominated the government in his country between the world wars. Three times Prime Minister, he is the only British prime minister to have served under three monarchs.

Upon Bonar Law's resignation due to health reasons in May 1923, Baldwin became Prime Minister and Leader of the Conservative Party. He called an election on the issue of tariffs and lost the Conservatives' parliamentary majority, after which Ramsay MacDonald formed a minority Labour government.

James Ramsay MacDonald FRS (12 October 1866 – 9 November 1937) was a British statesman who served as Prime Minister of the United Kingdom from 1929 to 1935. He was the first Labour Party politician to become Prime Minister, leading minority Labour governments in 1924 and in 1929–31. He headed a National Government from 1931 to 1935, dominated by the Conservative Party and supported by only a few Labour members.

In 1924, his first priority was to undo the perceived damage caused by the 1919 Treaty of Versailles, by settling the reparations issue and coming to terms with Germany. The king noted in his diary, "He wishes to do the right thing.... Today 23 years ago dear Grandmama died. I wonder what she would have thought of a Labour Government!"

Stanley Baldwin, 1st Earl Baldwin of Bewdley, (3 August 1867 – 14 December 1947) was a British statesman and Conservative Party politician who dominated the government in his country between the world wars. Three times Prime Minister, he is the only British prime minister to have served under three monarchs.

Baldwin's second government saw reforms in areas formerly associated with the Liberal Party. They included industrial conciliation, unemployment insurance, a more extensive old-age pension system, slum clearance, more private housing, and expansion of maternal and childcare. His government also saw the General Strike in 1926 and the Trade Disputes and Trade Unions Act 1927 to curb the powers of trade unions.

John Logie Baird makes the first public demonstration of a mechanical television on 26 January at Selfridge's department store in London (the first successful transmissions were in early 1923 and February 1924). Later, in July 1928, he demonstrated the first colour television.

The Representation of the People (Equal Franchise) Act 1928 was an Act of the Parliament of the United Kingdom. This act expanded on the Representation of the People Act 1918 which had given some women the vote in Parliamentary elections for the first time after World War I. The 1928 Act widened suffrage by giving women electoral equality with men. It gave the vote to all women over 21 years old, regardless of property ownership. Prior to this act only women over 30 who met minimum property qualifications could vote.

James Watson is an American molecular biologist, geneticist and zoologist who co-discovered the molecular structure of DNA. His discovery has been described by other biologists and Nobel laureates as the most important scientific discovery of the 20th C. Crick, Wilkins and Watson discovered the double helix structure of the DNA molecule

The effects of penicillium mould were isolated in 1928 by Scottish scientist Alexander Fleming, in his laboratory in the basement of St Mary's Hospital in London (now part of Imperial College). Fleming coined the term "penicillin"

MartinLuther King Jr was a leader of the African-American Civil Rights Movement. While fighting injustice meted out to African-Americans, he shunned violence. He used Christian doctrines but he looked towards Mahatma Gandhi’s non-violent movement. He dreamt that one day every human being would be judged by their ability, not skin colour. He died from a white fanatic’s bullet aged 39

James Ramsay MacDonald FRS (12 October 1866 – 9 November 1937) was a British statesman who served as Prime Minister of the United Kingdom from 1929 to 1935. He was the first Labour Party politician to become Prime Minister, leading minority Labour governments in 1924 and in 1929–31. He headed a National Government from 1931 to 1935, dominated by the Conservative Party and supported by only a few Labour members.

MacDonald's second government was in a stronger parliamentary position than his first, and in 1930 he was able to raise unemployment pay, pass an act to improve wages and conditions in the coal industry (i.e. the issues behind the General Strike) and pass a housing act which focused on slum clearances. In 1931, in the aftermath of the Great Depression, he was forced to form a National Government with the Conservatives and Liberals.

The Great Depression was a severe worldwide economic depression that took place mostly during the 1930s, beginning in the United States. The timing of the Great Depression varied across nations; in most countries it started in 1929 and lasted until the late-1930s. It was the longest, deepest, and most widespread depression of the 20th century.

The Great Depression started in the United States after a major fall in stock prices that began around September 4, 1929, and became worldwide news with the stock market crash of October 29, 1929 (known as Black Tuesday). Between 1929 and 1932, worldwide gross domestic product (GDP) fell by an estimated 15%. By comparison, worldwide GDP fell by less than 1% from 2008 to 2009 during the Great Recession. Some economies started to recover by the mid-1930s. However, in many countries the negative effects of the Great Depression lasted until the beginning of World War II.

RAF College Cranwell cadet Frank Whittle submitted his initial design for a turbo-jet to his superiors in 1928. It was whilst writing his thesis at the RAF College that Frank Whittle first developed the fundamental concepts of the turbojet engine. He was awarded his first patent for it in 1932. He spent a few more years actually building one, with the first running example being completed in 1937.

Cryptanalysis enabled the WWII Allies to read Enigma-enciphered Morse-coded communications of the Axis powers. The Enigma machines were portable cipher machines. Good operating procedures would have made them unbreakable but most of the German agencies that used Enigma used flawed procedures. It was broken by a Polish Cipher Bureau in Dec 1932, with the aid of French-supplied intelligence material obtained from a German.

In 1933, Harry Beck's iconic, diagrammatic map of the London Underground appeared for the first time. Existing maps were not easy to follow because they reflected the topography above ground. Beck realised that, once underground, passengers need not be bound by what lay above, and he could lay out the map in a simpler way that was easier to understand, a system that has been copied on metro system across the world.

Franklin Delano Roosevelt (January 30, 1882 – April 12, 1945), often referred to by his initials FDR, was an American statesman and political leader who served as the 32nd president of the United States from 1933 until his death in 1945.

A Democrat, he won a record four presidential elections and became a central figure in world events during the first half of the 20th century. Roosevelt directed the federal government during most of the Great Depression, implementing his New Deal domestic agenda in response to the worst economic crisis in US history. As a dominant leader of his party, he built the New Deal Coalition, which realigned American politics into the Fifth Party System and defined American liberalism throughout the middle third of the 20th century. He is often rated by scholars as one of the three greatest U.S. presidents, along with George Washington and Abraham Lincoln.

Stanley Baldwin, 1st Earl Baldwin of Bewdley, (3 August 1867 – 14 December 1947) was a British statesman and Conservative Party politician who dominated the government in his country between the world wars. Three times Prime Minister, he is the only British prime minister to have served under three monarchs.

With MacDonald's health in decline, he and Baldwin changed places: Baldwin was now Prime Minister, MacDonald Lord President of the Council. In October that year Baldwin called a general election. advised to make rearmament the leading issue in the election campaign against Labour, Baldwin said he would support the League of Nations, modernise Britain's defences and remedy deficiencies; but he also said: "I give you my word that there will be no great armaments". The main issues in the election were housing, unemployment and the special areas of economic depression

Sir Magdi Yacoub is one of the world's most respected cardiac surgeons. Born in Egypt, he decided early on that he wanted to become a doctor and help others. He studied medicine at Cairo University and thereafter moved to the UK Most of his innovations and pioneering work in the field of heart surgery came during his stint in the hospitals in UK He is well known for his innovations in tissue engineering, myocardial regeneration, and transplant immunology.

Edward VIII was king of the United Kingdom and the Dominions of the British Empire, and emperor of India, from 20 January 1936 until his abdication on 11 December the same year, after which he became the Duke of Windsor.

Edward became king on his father's death in early 1936. Only months into his reign, he caused a constitutional crisis by proposing to Wallis Simpson, an American who had divorced her first husband and was seeking a divorce from her second. The prime ministers of the UK and the Dominions opposed the marriage, arguing a divorced woman with two living ex-husbands was politically and socially unacceptable as a prospective queen consort. When it became apparent he could not marry Wallis and remain on the throne, Edward abdicated. He was succeeded by his younger brother, George VI.

The Jarrow March was a protest against the unemployment and poverty suffered in the English Tyneside town of Jarrow during the 1930s. Around 200 men marched from Jarrow to London, carrying a petition to the British government requesting the re-establishment of industry in the town. They went home believing they had failed. In subsequent years, the Jarrow March became recognised as a defining event of the 1930s

George VI was king of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 until his death in 1952. He was the last emperor of India and the first head of the Commonwealth.

As the second son of King George V, George VI was not expected to inherit the throne and spent his early life in the shadow of his elder brother, Edward who ascended the throne upon the death of their father in 1936. However, later that year Edward abdicated to marry divorcee Wallis Simpson, and George ascended the throne as the third monarch of the House of Windsor.

Arthur Neville Chamberlain (18 March 1869 – 9 November 1940) was a British statesman and Conservative Party politician who served as Prime Minister of the United Kingdom from May 1937 to May 1940.

Chamberlain is best known for his foreign policy of appeasement, and in particular for his signing of the Munich Agreement in 1938, conceding the German-speaking Sudetenland region of Czechoslovakia to Germany. When Adolf Hitler invaded Poland, the UK declared war on Germany on 3 September 1939, and Chamberlain led Britain through the first eight months of the Second World War. Chamberlain resigned the premiership on 10 May 1940, as he believed that a government supported by all parties was essential, and the Labour and Liberal parties would not join a government headed by him.

World War II (often abbreviated to WWII or WW2.) The vast majority of the world's countries - including all the great powers - eventually formed two opposing military alliances: the Allies and the Axis. A state of total war emerged, directly involving more than 100 million people from over 30 countries. The major participants threw their entire economic, industrial, and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources. WWII was the deadliest conflict in human history, marked by 50 to 85 million fatalities, most of whom were civilians in the Soviet Union and China. It included massacres, the genocide of the Holocaust, strategic bombing, premeditated death from starvation and disease, and the only use of nuclear weapons in war.

The National Registration Act 1939 established a National Register which began operating on 29 September 1939 (National Registration Day), a system of identity cards, and a requirement that they must be produced on demand or presented to a police station within 48 hours.

Sir Winston Leonard Spencer-Churchill (30 November 1874 – 24 January 1965) was a British politician, statesman, army officer, and writer, who was Prime Minister of the United Kingdom from 1940 to 1945 and again from 1951 to 1955. As Prime Minister, Churchill led Britain to victory in the Second World War. Ideologically an economic liberal and British imperialist, he began and ended his parliamentary career as a member of the Conservative Party, which he led from 1940 to 1955, but for twenty years from 1904 he was a prominent member of the Liberal Party.

Widely considered one of the 20th century's most significant figures, Churchill remains popular in the UK and Western world, where he is seen as a victorious wartime leader who played an important role in defending liberal democracy from the spread of fascism. Also praised as a social reformer and writer, among his many awards was the Nobel Prize in Literature.

The Battle of Britain: RAF Fighter Command thwarted the Luftwaffe's attempts to gain air supremacy over southern England, averting invasion and downing 1,733 German aircraft. This came at a cost: 915 British aircraft were lost and about 544 of 2,927 RAF aircrew. Their numerical disadvantage prompted the British Prime Minister, Winston Churchill to say 'Never in the field of human conflict was so much owed by so many to so few.'

The German invasion of Russia – Operation Barbarossa begins. More than 4.5 million troops of the Axis powers invade the USSR along a front stretching almost 3,000 km – the largest military operation in history would also result in the largest casualty rate

The attack on Pearl Harbor was a surprise military strike by the Imperial Japanese Navy Air Service against the United States naval base at Pearl Harbor, Hawaii Territory, on the morning of December 7, 1941.

The surprise attack came as a profound shock to the American people and led directly to the American entry into World War II in both the Pacific and European theatres. There were precedents for unannounced military action by Japan, but the lack of any formal warning, particularly while negotiations were still apparently ongoing, led President Franklin D. Roosevelt to proclaim December 7, 1941, "a date which will live in infamy". Because the attack happened without a declaration of war and without explicit warning, the attack on Pearl Harbor was later judged in the Tokyo Trials to be a war crime.

Stephen William Hawking was an English theoretical physicist, cosmologist, and author, who was director of research at the Centre for Theoretical Cosmology at the University of Cambridge at the time of his death. He was the Lucasian Professor of Mathematics at the University of Cambridge between 1979 and 2009.

Hawking achieved commercial success with works of popular science in which he discussed his own theories and cosmology in general. His book A Brief History of Time appeared on the British Sunday Times best-seller list for a record-breaking 237 weeks. He was a fellow of the Royal Society (FRS), a member of the Pontifical Academy of Sciences, and a recipient of the Presidential Medal of Freedom, the highest civilian award in the United States.

In 1963, Hawking was diagnosed with an early-onset slow-progressing form of motor neurone disease that gradually paralysed him. He died on 14 March 2018 at the age of 76, after more than 50 years battling the disease.

Colossus was a set of computers developed by British codebreakers in the years 1943–1945 to help in the cryptanalysis of the Lorenz cipher. Colossus used thermionic valves (vacuum tubes) to perform Boolean and counting operations. Colossus is thus regarded as the world's first programmable, electronic, digital computer, although it was programmed by switches and plugs and not by a stored program.

The existence of the Colossus machines was kept secret until the mid-1970s, although some of its personnel and secret information undoubtedly fueled further development in the U.S. in the late 1940s; the machines and the plans for building them were destroyed in the 1960s as part of the effort to maintain the secrecy of the project. This deprived most of those involved with Colossus of the credit for pioneering electronic digital computing during their lifetimes.