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Tourists once paid to watch the Panama Canal
Travel

Tourists once paid to watch the Panama Canal

When tourist cruises began transiting the Panama Canal in 1927, affluent travelers paid to sit in the tropical sun and watch its lock gates open and close.

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Fishing boats became emergency ferries after an explosion
Transport

Fishing boats became emergency ferries after an explosion

When an explosion wrecked roads and disrupted ordinary transport, fishing boats became rescue craft and ferries. Their shallow drafts let them reach…

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Breaking out of a supposedly inescapable roof prison
History

Breaking out of a supposedly inescapable roof prison

Casanova escaped Venice's Piombi prison by hiding an iron spike in a hollowed-out Bible and digging through the ceiling. After crossing the palace's lead roof…

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Why Dragnet actors sounded like they were speed-reading
Culture & entertainment

Why Dragnet actors sounded like they were speed-reading

Jack Webb disliked dramatic pauses and emotional acting, so he pushed actors to read their lines quickly from teleprompters.

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Why some people heard Yanny and others Laurel
Culture & entertainment

Why some people heard Yanny and others Laurel

The recording contains both high- and low-frequency cues: listeners who picked up more of the higher frequencies heard “Yanny,” while those who heard more of…

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A mathematician crawled around to animate a cat
Culture & entertainment

A mathematician crawled around to animate a cat

For the 1968 computer film Kitty, Viktor Minakhin needed equations describing a cat's movement. Colleague Nikolai Konstantinov recalled that an uncooperative…

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Burned wartime aircrew founded a club named after their own experimental treatment
Health

Burned wartime aircrew founded a club named after their own experimental treatment

Patients treated by plastic surgeon Archibald McIndoe formed the Guinea Pig Club in 1941. Reconstructive surgery brought them together; humor and continuing…

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George Pullman cut workers' pay but kept rents high
Transport

George Pullman cut workers' pay but kept rents high

Pullman cut wages while keeping rents in his company town high. Because the company owned the homes as well as the jobs, workers took the pay cut without…

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The inaudible sound that can jam hidden microphones
Technology

The inaudible sound that can jam hidden microphones

Ultrasonic scramblers emit high-frequency noise that people can’t hear but that can overwhelm some digital microphones, leaving recordings unusable.

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Chicago's 1933 World's Fair had money-like certificates of its own
Economy

Chicago's 1933 World's Fair had money-like certificates of its own

Merchants distributed small-value certificates usable for the fair and services around the city, including hotels and transport. The American Numismatic…

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The doctor who injected sheep thyroid into patients
Health

The doctor who injected sheep thyroid into patients

When the thyroid cannot provide enough hormone, the body’s systems slow down and severe hypothyroidism can cause myxedema. In 1891, Murray injected patients…

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Why Victorian tourists walked over the sea
Travel

Why Victorian tourists walked over the sea

Victorian pleasure piers let visitors take in the sea air without the nausea associated with riding on waves. Engineer Eugenius Birch helped drive the British…

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A Paris train overshot the platform—and the building
Transport

A Paris train overshot the platform—and the building

In 1895, an arriving train at Montparnasse failed to stop in time, crossed the concourse, and broke through the station's exterior wall. The locomotive came…

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When Charlie Chaplin turned murder into comedy
Culture & entertainment

When Charlie Chaplin turned murder into comedy

Monsieur Verdoux casts Chaplin as a man who marries and murders women for money, drawing on the case of French killer Henri Désiré Landru. Instead of the…

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The envoy who claimed Alexander was treated like a god
History

The envoy who claimed Alexander was treated like a god

Onesicritus, a philosopher accompanying Alexander the Great in India, wrote that local ascetics praised Alexander as a god. His contemporaries accused him of…

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Making a machine cheaper to run can increase total fuel use
Economy

Making a machine cheaper to run can increase total fuel use

Greater efficiency lowers the cost of doing a task, which can encourage people to do much more of it. Jevons described this problem for coal-powered industry.…

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The metal machine that breathed for polio patients
Health

The metal machine that breathed for polio patients

Inside the metal chamber, pressure around the patient’s body rose and fell. When it dropped, the chest expanded and pulled air in; when it rose again, the…

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Britain enforced India's salt tax with a giant hedge
Economy

Britain enforced India's salt tax with a giant hedge

The colonial Inland Customs Line stretched roughly 2,500 miles, with long sections reinforced by thorny vegetation. Guards searched for salt carried across…

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