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X-rays gave the periodic table a better order
Science

X-rays gave the periodic table a better order

Henry Moseley's measurements in 1913 and 1914 linked each element's X-ray frequencies to its atomic number. That gave the table a physical ordering principle…

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A drop of liquid metal can beat like a tiny heart
Science

A drop of liquid metal can beat like a tiny heart

Researchers have made gallium droplets repeatedly spread and contract using an applied voltage in a surrounding liquid. Electrical and chemical changes at the…

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A medieval map placed the world inside Christ's body
History

A medieval map placed the world inside Christ's body

The Ebstorf map showed Christ's head, hands, and feet at the edges, with Jerusalem at the center and east at the top. It organized geography through a…

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How Hertha Ayrton explained ripples in beach sand
Science

How Hertha Ayrton explained ripples in beach sand

As waves move across a beach, they push grains back and forth. That motion builds ridges at right angles to the waves, rather than parallel to them. Hertha…

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The mathematician who turned down a million dollars
History

The mathematician who turned down a million dollars

The Fields Medal and a $1 million Clay prize followed Perelman’s solution, but he declined both and returned to live quietly with his mother. Mathematics had…

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Movie footsteps became a performance of their own
Culture & entertainment

Movie footsteps became a performance of their own

Jack Foley helped add synchronized effects to Show Boat as cinema moved into sound. Watching the picture, performers supplied noises that matched what the…

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How quickly prejudice took hold in one classroom
Psychology

How quickly prejudice took hold in one classroom

A teacher can make a distinction as trivial as eye color feel important by giving one group extra status and the other extra scrutiny. Students soon absorb…

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How a Hawaiian radio network helped create Wi-Fi
Technology

How a Hawaiian radio network helped create Wi-Fi

In 1971, University of Hawaii researchers built ALOHAnet to connect computers by radio. It sent packets whenever a computer had data, retransmitting after…

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The Chicago Plan tried to separate your money from bank lending
Economy

The Chicago Plan tried to separate your money from bank lending

The Depression-era proposal called for full reserve backing of transaction deposits. Lending would need separate funding rather than being bundled with…

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When copper crosses were money
Economy

When copper crosses were money

These were not coins for a pocket: Katanga crosses were copper ingots up to two pounds each. People used them for major deals, including land purchases, slave…

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Bombardier put seven passengers on tracks and skis
Transport

Bombardier put seven passengers on tracks and skis

Joseph-Armand Bombardier's B7 snow vehicle used front skis for steering and rear tracks for propulsion. Its rubber-covered sprocket system helped the tracks…

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A newborn's Apgar score is a snapshot taken twice
Health

A newborn's Apgar score is a snapshot taken twice

At one and five minutes after birth, five signs—including heart rate, breathing and muscle tone—receive scores adding up to ten. Comparing the assessments…

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Europe tried a shared currency long before the euro
Economy

Europe tried a shared currency long before the euro

The members agreed to standardize gold and silver coins, but the value depended on the metal inside. The Papal States issued lighter silver coins, breaking…

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Russian exiled thinker made art a holy weapon
Myths & mysteries

Russian exiled thinker made art a holy weapon

Exiled from Soviet Russia for rejecting Marxist materialism, Berdyaev saw human creativity as a spiritual power. He argued that the unfinished universe calls…

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Three explorers crossed Antarctic winter to bring back penguin eggs
Travel

Three explorers crossed Antarctic winter to bring back penguin eggs

In 1911, Edward Wilson, Henry Bowers and Apsley Cherry-Garrard sought emperor penguin embryos for research on bird development. They collected five eggs after…

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Roman dodecahedra still have no known purpose
History

Roman dodecahedra still have no known purpose

Their holes vary in size, and examples appear across Europe, leaving researchers with theories but no use that fits them all. They are a rare ancient…

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Orient Express passengers were told to pack revolvers
Travel

Orient Express passengers were told to pack revolvers

The train crossed the bandit-infested Balkans, so its founder, Georges Nagelmackers, advised wealthy passengers on the 1883 inaugural trip to bring revolvers.

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A glacier hid a missing plane for 50 years
Transport

A glacier hid a missing plane for 50 years

The pilots misjudged their position after flying into the jet stream, then descended into a glacier. An avalanche buried the wreckage, which remained hidden…

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