Blog

Posts, updates, and occasional notes that sit alongside The Butterfly Effect.

Portrait of Sir Isaac Newton, 1689, by Godfrey Kneller

Paid for in Fish

Jul 5, 2026By Andy Barca

On 5 July 1687, Isaac Newton's Principia Mathematica came off the press in London. The Royal Society had already spent its year's budget on a book about fish, so Edmond Halley paid the printing costs himself and talked Newton out of pulling the whole thing over a priority dispute with Robert Hooke.

The United States Declaration of Independence, 1776

Don't Bet Against the Colony

Jul 4, 2026By Andy Barca

On 4 July 1776, the Second Continental Congress adopted the Declaration of Independence, a treason confession from thirteen colonies with no army, no navy and no treasury. Two hundred and fifty years on, the doubters are still losing.

Enver Bey and Niyazi Bey, leaders of the Young Turk Revolution, 1908 postcard

The Sultan Who Blinked

Jul 3, 2026By Andy Barca

On 3 July 1908, Major Ahmed Niyazi raided an armoury in Macedonia and marched into the mountains demanding a constitution. Three weeks later Sultan Abdul Hamid II gave in. The men who forced him did not just modernise the Ottoman Empire - they eventually organised a genocide and dragged it into the First World War.

Brazilian army entering Salvador after the siege, 1823

Eighty-Three Ships in the Dark

Jul 2, 2026By Andy Barca

On 2 July 1823, a Portuguese garrison slipped out of Salvador aboard 83 ships after a 16-month siege, ending three centuries of colonial rule in Brazil. The war that actually won Brazil's independence looked nothing like the schoolbook version.

Union Jack and Chinese flags at the Hong Kong handover ceremony, 1997

The Great Chinese Takeaway

Jul 1, 2026By Andy Barca

On 1 July 1997, Britain handed Hong Kong back to China after 156 years of colonial rule, closing the last major open account from the Opium Wars. Deng Xiaoping designed the deal but died four months before the flag came down, and the fifty-year promise he made has been fraying ever since.

A long road ahead

Halfway Round the Sun

Jun 30, 2026By Andy Barca

Six months ago I set out to write a new 'this day in history' entry for every single day of the year. I am still going. Here is what 181 days of daily history writing actually looks like from the inside.

Trees flattened by the Tunguska explosion, Siberia, 1908

The Sky Split in Two

Jun 30, 2026By Andy Barca

On 30 June 1908, the largest impact event in recorded history exploded over Eastern Siberia. It flattened 2,150 km² of forest and left no crater. We are still arguing about what it was.

Portrait of Sergei Witte, Russian Minister of Finance and Prime Minister

The Last Repair

Jun 29, 2026By Andy Barca

On 29 June 1849, Sergei Witte was born in Tiflis. As Russia's Minister of Finance he industrialised the empire, built the Trans-Siberian Railway, and drafted the October Manifesto that created a constitutional monarchy. Nicholas II fired him six months later.

Coronation portrait of Queen Victoria, 1838

Woken at Four by the Guns

Jun 28, 2026By Andy Barca

On 28 June 1838, a nineteen-year-old queen was crowned at Westminster Abbey in a ceremony generally agreed to be a shambles. The Archbishop put the ring on the wrong finger. An 82-year-old lord fell down the altar steps. The reign that followed lasted sixty-three years and built an empire.

Portrait of Joseph Smith, founder of the Latter Day Saint movement

A Prophet in Broad Daylight

Jun 27, 2026By Andy Barca

On 27 June 1844, Joseph Smith was shot dead at Carthage Jail while running for President of the United States. The mob that killed him made the same mistake as everyone who has ever underestimated what a martyr story can do for a new religion.