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When you are conscious but unable to move
Health

When you are conscious but unable to move

The striking mismatch is that the mind can be awake while the body cannot respond. Locked-in syndrome can prevent movement and speech without erasing…

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Why TV runs at 29.97 frames per second
Culture & entertainment

Why TV runs at 29.97 frames per second

Engineers chose the fractional rate to keep color television signals from interfering with audio.

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The hidden signals that ruined copied tapes
Culture & entertainment

The hidden signals that ruined copied tapes

Macrovision added hidden signals to rental tapes that confused a VCR's automatic gain control, leaving copies made on a connected VCR badly distorted.

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Why audio CAPTCHAs sound demonic
Technology

Why audio CAPTCHAs sound demonic

Engineers layer speech with distortion and background noise to make automated transcription harder, but the result can sound eerie or demonic.

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Prussia's regiment of exceptionally tall soldiers
History

Prussia's regiment of exceptionally tall soldiers

Frederick William I’s fascination with height turned a military regiment into a personal obsession. He recruited, bought and even kidnapped exceptionally tall…

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Strange physical phenomenon of aircraft wake turbulence
Transport

Strange physical phenomenon of aircraft wake turbulence

A wing makes lift by pushing air downward, and the pressure difference curls air into spinning vortices behind its wingtips. Those invisible swirls trail the…

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The terrifying sound that dominates movie trailers
Culture & entertainment

The terrifying sound that dominates movie trailers

A braam is a booming synthetic brass hit used to build sudden tension; in theaters, its impact can rumble through the seats and make danger feel close.

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The ancient ratio hiding in movie compositions
Culture & entertainment

The ancient ratio hiding in movie compositions

Some directors use the golden ratio as a compositional guide, but no formula can guarantee a balanced-looking frame.

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Why Korea's deadliest border became a wildlife haven
Travel

Why Korea's deadliest border became a wildlife haven

Restricted human access has left parts of the Korean Demilitarized Zone relatively undisturbed. Wetlands and other habitats support wildlife including rare…

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Tourists stand on a boulder above a 3,000-foot drop
Travel

Tourists stand on a boulder above a 3,000-foot drop

Kjeragbolten is a glacial boulder wedged in a deep crevasse in Norway’s mountains, with a 3,000-foot drop below.

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Mahjong traveled abroad as 'Sparrow'
Games

Mahjong traveled abroad as 'Sparrow'

A 1923 English-language manual by Ly Yu Sang was titled Sparrow: The Chinese Game Called Ma-Ch'iau. It belongs to the international mahjong craze of the…

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When computers colored classic black-and-white films
Culture & entertainment

When computers colored classic black-and-white films

In the 1980s, media companies used early computers to add color to classic black-and-white films. Many directors saw the results as a violation of the…

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The rare mystery of spontaneous cancer remission
Health

The rare mystery of spontaneous cancer remission

In a spontaneous remission, a cancer shrinks or disappears without an expected explanation, even though treatment may not account for it. Researchers suspect…

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The balloon release that disrupted Cleveland
History

The balloon release that disrupted Cleveland

The charity’s release of more than a million balloons became a hazard across Cleveland: flights were grounded, traffic snarled, and a Coast Guard search…

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Your heartbeat could become your phone's password
Technology

Your heartbeat could become your phone's password

Some security systems can use an electrocardiogram (ECG) to recognize a person's heartbeat pattern, much like a fingerprint. It’s a biometric password, though…

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A drug’s mirror image can be deadly
Science

A drug’s mirror image can be deadly

Some drug molecules come in left- and right-handed forms. A body protein has a shape that may fit one hand neatly and the other awkwardly, changing how the…

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Mysterious grooved discs of an ancient mountain
Myths & mysteries

Mysterious grooved discs of an ancient mountain

The Dropa story claims that hundreds of grooved discs found in a Himalayan cave in 1938 contain markings about an extraterrestrial crash. The artifacts…

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Why traffic lights use red and green
Transport

Why traffic lights use red and green

Red already meant danger and stop on railways, while green signaled a clear route, so early traffic lights borrowed the code. Drivers got simple instructions…

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