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How mercury helped prove Boyle's Law
Science

How mercury helped prove Boyle's Law

In Boyle’s experiment, a column of heavy mercury pressed down on trapped air, squeezing it into less space. With temperature held roughly steady, twice the…

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The silent whistle tested on zoo animals
Science

The silent whistle tested on zoo animals

The whistle was adjustable: Galton could raise or lower its pitch, then use his walking stick to test what different animals could hear. Humans couldn’t hear…

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Readers tried to predict Nellie Bly's return down to the finish
Travel

Readers tried to predict Nellie Bly's return down to the finish

While her around-the-world reports were traveling back to New York, the World newspaper ran a contest asking how long the journey would take. PBS records more…

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The widow who bought a fleet for revenge
History

The widow who bought a fleet for revenge

After her husband was executed for treason, Jeanne de Clisson sold her estates and bought warships. For the next decade, she attacked French vessels in the…

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A studio faked a star's death for publicity
Culture & entertainment

A studio faked a star's death for publicity

Because actors were often kept anonymous to limit their bargaining power, Carl Laemmle promoted Florence Lawrence by inventing a report of her death, then…

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The historian who said money was never just barter
Economy

The historian who said money was never just barter

Del Mar looked past the familiar story of people swapping goods and asked who had the power to issue money. He documented states creating currencies and…

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The D-Day tank that wore a flotation screen
Transport

The D-Day tank that wore a flotation screen

A Duplex Drive tank unfolded a tall canvas screen around its hull to trap enough air to float, while propellers driven by the tank’s engine pushed it toward…

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The cash prize that launched the Rocket
Transport

The cash prize that launched the Rocket

The Rainhill Trials offered a £500 prize for a locomotive that could haul a load quickly and reliably on the new Liverpool and Manchester Railway. George…

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Babylon's ancient map put Babylon at the center
History

Babylon's ancient map put Babylon at the center

The 6th-century BC Imago Mundi surrounded Babylon with rival lands and placed mythical creatures beyond the ocean. It put the familiar world on the map and…

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The explorer who survived a factory accident and became a spy
Travel

The explorer who survived a factory accident and became a spy

After a childhood factory accident tore away part of her scalp, Freya Stark became a solo explorer in the male-dominated Middle East, enduring dysentery and…

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Why believing in yourself can help you persist
Psychology

Why believing in yourself can help you persist

Confidence can act like a forecast: if you believe you can make progress, another attempt feels worth the effort. That extra attempt matters because…

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One leather chemist casually saved Indian rail seats
Transport

One leather chemist casually saved Indian rail seats

Leather seats take a beating from bodies, heat and grime, then dry and crack. A leather chemist’s treatment restored the material and kept Indian rail seats…

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Why airlines feared in-flight phone calls
Travel

Why airlines feared in-flight phone calls

When AeroMobile introduced in-flight GSM calls in 2008, regulators and travelers worried about the disruption of people talking loudly in a confined cabin.…

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When economists stopped counting only cash
Economy

When economists stopped counting only cash

The 1959 Radcliffe Report argued that watching cash and bank reserves alone missed borrowing and credit. A household or business could still spend using…

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Regardie saved astral magic by betraying everyone he knew
Myths & mysteries

Regardie saved astral magic by betraying everyone he knew

When Israel Regardie thought the Golden Dawn was collapsing under its leaders' egos, he published its secret rituals despite its oaths of secrecy. His books…

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The monster that reads villagers’ gossip aloud
History

The monster that reads villagers’ gossip aloud

Each year, a villager in a furry costume represents the Badalisc, a mythical creature with a huge mouth. The village parades the monster, then hears a rhyming…

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The camera that froze an insect's flight with sparks
Science

The camera that froze an insect's flight with sparks

A fast insect would smear across a photograph during a long exposure. A brief spark lit it for just an instant, freezing one clear position as if the flash…

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The locomotive built to never turn around
Transport

The locomotive built to never turn around

With controls at both ends, the locomotive changes direction by switching cabs instead of turning on a giant turntable. It treats a turnaround as an optional…

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