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12 February 1912, in Beijing

Empress Dowager Longyu authorized the Qing emperor's abdication in Beijing on 12 February 1912, acting on behalf of the child Xuantong Emperor, Puyi. He was six years old and did not negotiate or meaningfully choose the settlement.

The abdication edicts transferred sovereign authority to a republican state and empowered Yuan Shikai to organize a provisional republican government and negotiate North–South unification.

The Articles of Favorable Treatment

The court accepted terms under which Puyi retained his imperial title, initially remained in the Forbidden City, and was promised protection of his property and an annual allowance of 4,000,000 taels, later to become 4,000,000 yuan.

So Qing political authority formally ceased while a nominal imperial household continued inside the palace walls.

What the edict did not do

It did not found the Republic of China. Sun Yat-sen's Nanjing provisional government had been operating since 1 January 1912; the edict ended Qing rule and enabled political unification.

Sun tendered his resignation the next day, and the provisional senate elected Yuan Shikai on 15 February. The familiar “268 years” counts Qing rule from the 1644 capture of Beijing; counting from the adoption of the dynastic name Great Qing in 1636 gives 276.

11 November 1912: read to the Cambridge Philosophical Society

William Lawrence Bragg, a 22-year-old Cambridge research student, read “The Diffraction of Short Electromagnetic Waves by a Crystal” to the Cambridge Philosophical Society on 11 November 1912. The published paper identifies J. J. Thomson as the scholar who communicated it to the society.

Bragg reinterpreted the spots from the earlier Munich X-ray experiment as interference among X-rays reflected from successive planes in a crystal. The relation this produced is the one later called Bragg's law.

A cosine, not a sine

The 1912 presentation printed the condition as nλ = 2d cos θ, with θ measured from the plane normal. The modern convention writes nλ = 2d sin θ with θ measured from the plane itself — the discrepancy is one of angle convention.

The paper was not a free-standing equation either. Bragg used the observed pattern to analyze the face-centered structure of zinc sulfide.

The suggestion from the floor

In the discussion after the talk, C. T. R. Wilson suggested testing a strongly cleaving material such as mica. Bragg followed it up and demonstrated specular X-ray reflection from mica.

He sent that result to Nature on 8 December; the talk itself had been abstracted in Nature on 5 December. The full paper appeared in the 1913 Proceedings of the Cambridge Philosophical Society, volume 17, pages 43–57.

3 February 1913: three states at once

The legislatures of Delaware, Wyoming and New Mexico all approved the proposed Sixteenth Amendment on 3 February 1913. With 35 states already recorded as having ratified, those votes carried the proposal past the required three-fourths — 36 of the 48 states then in the Union.

Because the three acted the same day, official sources differ over which should be called the 36th. Congress's Constitution Annotated deliberately lists “Delaware, Wyoming, or New Mexico.”

One sentence, and the words that do the work

The text empowered Congress to tax incomes “from whatever source derived,” without apportionment among the states and without regard to any census or enumeration.

Congress already held broad taxing power. What the amendment principally removed was the requirement that an income tax treated as direct be apportioned among the states by population.

Nothing came out of a paycheck that day

No income-tax statute was enacted on 3 February, and the amendment did not create the Internal Revenue Service. The immediate constitutional change was the removal of the apportionment obstacle for taxes on income.

Secretary of State Philander C. Knox certified that the amendment had become part of the Constitution 22 days later, on 25 February.

23 December 1913: signed just after six

The Senate completed action on the conference report at about 2:30 p.m. on 23 December 1913. President Woodrow Wilson signed the resulting bill at the White House a few minutes after 6 p.m.

He used four gold pens, with members of his family, the Cabinet and the congressional leadership gathered around him. Carter Glass and Robert L. Owen, the House and Senate banking chairmen behind the legislation, stood beside him.

What H.R. 7837 actually set up

The signature made the bill Public Law 63-43, the Federal Reserve Act. Its stated purposes included establishing Federal Reserve Banks, furnishing an elastic currency, rediscounting commercial paper and improving banking supervision.

It created a body called the Federal Reserve Board and authorized between eight and twelve Reserve districts and Reserve Banks. It did not choose twelve cities.

A central bank that existed only on paper

By nightfall the legal framework existed and little else. The administration still had to draw district boundaries, select Reserve Bank cities, organize and staff the banks and appoint the Board — work that took most of 1914.

Twelve Reserve Banks were eventually settled on, and they opened on 16 November 1914.

12 August 1914: a second British declaration

On 12 August 1914, Foreign Secretary Sir Edward Grey sent Austria-Hungary's ambassador in London, Albert Mensdorff-Pouilly, an official letter declaring war. Britain had been at war with Germany since 4 August; the alliance groupings did not produce one universal state of war, so a separate declaration was needed.

The British notice said Austria-Hungary's rupture with France obliged His Majesty's Government to announce that a state of war existed between Britain and Austria-Hungary from midnight.

Britain conveys France's declaration too

France and Austria-Hungary had already broken off diplomatic relations, so Britain acted as intermediary and conveyed the French declaration to Mensdorff along with its own communication.

Grey sent the formal notice with a sorrowful private farewell letter to Mensdorff, asking him to come and shake hands.

Eight in the evening, midnight in law

Mensdorff noted that the communication arrived at 8 p.m. and that he telegraphed its contents to Vienna at 8:15 p.m.

The legal state of belligerency waited for midnight, at the 12–13 August boundary, and the London Gazette notice was published on 13 August. An Admiralty order to commence hostilities followed the declaration.

6 April 1917 took three separate acts

The Senate had approved the war resolution 82–6 on 4 April 1917. At 3:12 a.m. on 6 April the House concurred, 373–50.

Woodrow Wilson signed it at the White House at 1:18 p.m., using a gold pen handed to him by Edith Wilson. Congress did not take one vote that day — the declaration needed all three steps.

What the resolution actually said

The joint resolution formally declared that a state of war existed between the United States and the Imperial German Government, and authorized the president to use the country's military forces and governmental resources to prosecute it.

It named Germany and nobody else. The United States did not declare war on Austria-Hungary until December 1917.

The fifty who voted no

House Majority Leader Claude Kitchin opposed the resolution despite his leadership position. Jeannette Rankin of Montana, the first woman elected to Congress, said she wanted to stand by her country but could not vote for war.

No American troops entered major combat on 6 April. Wilson issued a wartime proclamation that day, including regulations governing people classified as German enemy aliens, and the Navy began carrying out wartime orders immediately.

Late January or early February 1918

Evidence reconstructed from local reporting and later testimony indicates that the physician Loring Miner encountered an unusually severe influenza-like outbreak in rural Haskell County, Kansas, in late January or early February 1918.

Miner considered the illness alarming enough to report even though influenza was not ordinarily a notifiable disease.

The local Santa Fe Monitor documented widespread illness by 21 February, reporting that nearly everyone in the countryside had "lagrippe or pneumonia."

The paper trail arrives in April

The surviving federal notice appeared only on 5 April, in Public Health Reports. It said that on 30 March the occurrence of 18 severe influenza cases and three deaths at Haskell had been reported.

That notice records when the outbreak was reported, not when the 18 illnesses began. No documented federal investigation followed.

The illness subsided locally; a major influenza outbreak was recorded at Camp Funston in March, though direct transmission from Haskell remains a hypothesis.

What "first observed" cannot mean here

No contemporary virological test or surviving specimen establishes that the Haskell illness was caused by the pandemic H1N1 virus; the cases were diagnosed symptomatically.

Scholars dispute whether Haskell was the pandemic's origin at all. Other proposed precursors include illnesses in France and Britain in 1916–17, northern China, and earlier circulation elsewhere in the United States.

No exact January day is supported by the evidence — "late January or early February" is the defensible range.

A crude extract, a numbered dog, and one hour of readings

Nothing was announced on 27 July 1921. The date is a widely repeated anniversary for work in J. J. R. Macleod's University of Toronto physiology laboratory, where Frederick Banting — a physician and surgeon, not a biochemist — and the student Charles Best were injecting extracts of degenerated dog pancreas into dogs whose own pancreases had been removed.

After early surgical failures, the pair had two dogs whose pancreatic ducts had been tied for about seven weeks. They removed the degenerated pancreas of Dog 391 and prepared an extract from it.

What they produced was a crude preparation they called "isletin," not chemically pure insulin.

27 July or 30 July?

The University of Toronto's archive-based exhibition puts the preparation and injection on the morning of 30 July, into a mildly diabetic terrier recorded only as Dog 410. Banting and Best's readings showed its blood sugar falling from 0.20 percent to 0.12 percent in the hour after the injection.

The commemorated 27 July appears to derive from the surviving Dog 410 chart, which is dated across 27–31 July. The archive-based reconstruction places the first injection and promising result on 30 July.

The experiments themselves had begun on 17 May 1921, according to that same archive.

What the result was worth, and what it was not

The remaining experiments that day were inconclusive. Dog 410 was comatose the next morning and died later that day, and no autopsy was performed.

The numbers cannot now be checked: the pair worked with a crude colorimeter and may not have sampled quickly enough for the readings to be trusted. They wrote excitedly to Macleod, who was away at the time, but they had neither purified a human-ready drug nor announced a discovery.

J. B. Collip joined the work in December 1921 and produced extract pure enough for clinical use, and the first widely publicized announcement came when Macleod presented the Toronto group's clinical evidence on 3 May 1922.

11 January 1922, Toronto General Hospital

On 11 January 1922 the house physician Ed Jeffrey injected Leonard Thompson with 15 cc of a beef-pancreas extract prepared by Frederick Banting and Charles Best, under the clinical direction of Walter Campbell. Thompson's family had consented to the experimental treatment.

The injections went into Thompson's buttocks, and the preparation was recorded as "Macleod's serum."

Thompson weighed under 65 pounds and was surviving on a restricted diet of 450 calories a day.

What the extract did

His blood sugar fell only from 0.440% to 0.320%, and twenty-four-hour urinary glucose from 91.5 grams to 84 grams. The ketones did not clear and there was no visible clinical improvement.

The impurities produced a sterile abscess. Clinicians judged the reaction to outweigh the modest biochemical effect and stopped further injections of that preparation.

The success came twelve days later

On 19 January James Bertram Collip found a better purification method, and on 23 January Campbell administered Collip's extract to Thompson, whose blood sugar fell to normal within a day and whose condition improved markedly.

The listed event conflates the two dates: 11 January is securely the first injection of the Toronto extract into a human, but the first unambiguously successful human treatment was 23 January.

The Toronto group was not yet consistently calling the material insulin — contemporary records used pancreatic extract, "Macleod's serum" and "isletin" — and adopted the name in a paper prepared in May 1922.

3 April 1922: the plenum after the congress

At its first plenum following the Eleventh Party Congress, on 3 April 1922, the Central Committee of the Russian Communist Party (Bolsheviks) elected Joseph Stalin to the newly created position of General Secretary. The party would not take the All-Union name until 1925, and the USSR itself was created only that December.

The same plenum elected a three-person Secretariat: Stalin as General Secretary, with Vyacheslav Molotov and Valerian Kuibyshev as secretaries.

The job as it was written down

Party leaders wanted a senior figure to take charge of a Secretariat that had struggled to master a growing administrative workload. Stalin's candidacy was discussed at the congress, but the decision was the new Central Committee's.

The plenum adopted Lenin's draft instructions requiring Stalin to obtain deputies and assistants who would relieve him of most government-office work, leaving him general management and major questions of principle. On 25 April he was formally relieved as People's Commissar of the Workers' and Peasants' Inspection.

Not a succession

The appointment did not make Stalin head of state or formally designate him Lenin's successor. It put him at the head of the Secretariat's administrative work.

The post's later dominance was not inherent in its original formal description. In December 1922 Lenin warned the party congress about the authority concentrated in Stalin's hands, and in January 1923 recommended considering his removal.

The best-supported date: 14 April 1932, at the Cavendish

On the best-supported reconstruction, at Cambridge's Cavendish Laboratory on 14 April 1932, Ernest Walton directed accelerated protons at a thin lithium target and observed bright scintillations characteristic of alpha particles on a fluorescent screen.

The first successful disintegrations appeared at only about 125 kilovolts, far below the accelerator's intended maximum.

John Cockcroft immediately checked and confirmed the observation, and Ernest Rutherford — who had urged the pair to stop hunting only for gamma rays and look directly for alpha particles — was invited to inspect the screen.

Lithium into two alphas

The reaction converted lithium-7 plus a proton into two helium-4 nuclei. The initially measured alpha range was about 8.4 cm in air; refined measurements gave about 8.6 MeV per particle and roughly 17.2 MeV released in total.

This was the first artificial nuclear disintegration produced with accelerated particles, and it supplied an experimental test of mass–energy equivalence.

Rutherford had already induced transformations using naturally emitted alpha particles; the distinction here was the use of artificially accelerated ones.

Not fission, and not the paper's date

The process was proton-induced transmutation of a light nucleus, not the fission of a heavy nucleus, which was identified in 1938–39.

Cockcroft and Walton quickly performed range and paired-emission checks, dated their first Nature communication 16 April and saw it published on 30 April; neither date is the date of the observation.

A modern reconstruction from Cavendish records and Walton's own later account both give 14 April, while the American Institute of Physics historical exhibit hedges between 13 and 14 April.

The evening of 27 February 1933

An arson fire erupted in Berlin's Reichstag building on the evening of 27 February 1933. Firefighters raised the highest alarm at 9:42 p.m., and the wood-panelled plenary chamber burned out completely before the fire was brought under control around 11 p.m.

The chamber was destroyed. The masonry building as a whole was not burned to the ground.

Arrested inside, confessing at once

Police arrested Marinus van der Lubbe, a 24-year-old Dutch council communist, inside the burning parliament. He confessed immediately and denied having accomplices.

The Nazi leadership blamed the Communist Party regardless and cast the fire as the opening signal of an attempted uprising. Hitler and Joseph Goebbels went to the Reichstag on hearing of it, while Hermann Göring, acting Prussian interior minister, directed official measures at the scene.

What the evidence settles, and what it does not

Arson caused the fire and van der Lubbe's physical involvement is well established. Whether he acted entirely alone or was assisted or exploited by Nazis remains contested, and four Communist co-defendants were later acquitted for lack of evidence.

Terror against political opponents began that night, with Communists and Social Democrats the principal immediate targets. The Reichstag Fire Decree, suspending enumerated constitutional rights until further notice, was signed by Hindenburg the following day.