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Why runway numbers keep changing
Travel

Why runway numbers keep changing

Runway numbers give the magnetic heading rounded to the nearest ten degrees, so runway 27 points to 270 degrees. Because Earth's magnetic poles shift,…

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Why Vatican City has a heliport instead of an airport
Travel

Why Vatican City has a heliport instead of an airport

At just 109 acres, the city-state has little room for a runway without sacrificing historic architecture, so the Pope travels by heliport instead. It serves…

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Nuclear submarines move slower than you might think
Transport

Nuclear submarines move slower than you might think

Most modern attack submarines reach about 30 to 40 miles per hour underwater; going faster can create cavitation bubbles and noise that gives away their…

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Why some pilots detour to give passengers an aurora view
Travel

Why some pilots detour to give passengers an aurora view

To give passengers on both sides a view, pilots flying over places such as Iceland or northern Canada sometimes make a slow turn when the Northern Lights…

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Snow is technically a mineral
Science

Snow is technically a mineral

As water freezes, its molecules settle into a repeating crystal pattern, which makes ice a mineral. Snowflakes grow as ice crystals in clouds, each with that…

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Chuck E. Cheese began as an Atari strategy
Culture & entertainment

Chuck E. Cheese began as an Atari strategy

Atari co-founder Nolan Bushnell wanted restaurants to buy his arcade games, but many were reluctant to purchase bulky cabinets. So he opened a family pizza…

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The Tarot Death card usually symbolizes change, not literal death
Myths & mysteries

The Tarot Death card usually symbolizes change, not literal death

In tarot, the Death card usually points to transition, change, or leaving an old habit behind—not a literal death.

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Why your waterproof phone can still drown
Technology

Why your waterproof phone can still drown

An IP68 rating applies only within specified limits for depth and time, and tests use still, clean water. Chlorinated pools and salt water fall outside those…

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A tiny scratch can make your eye feel as if something is still stuck in it
Health

A tiny scratch can make your eye feel as if something is still stuck in it

The cornea's sensitive surface can keep producing that gritty feeling after the object is gone. Minor abrasions often heal within a few days, but pain alone…

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A flight's shortest phases demand some of its busiest work
Travel

A flight's shortest phases demand some of its busiest work

During takeoff and landing, crews manage rapid changes in speed, altitude, and aircraft configuration close to the ground. Accident statistics give these…

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Early Apple computers saved files on cassette tapes
Technology

Early Apple computers saved files on cassette tapes

Early Apple computers could save files to ordinary cassette tapes. Users connected a cassette recorder to the computer to store code or documents.

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The Alien costume that used part of a human skull
Culture & entertainment

The Alien costume that used part of a human skull

The dome at the front of the original Xenomorph costume’s elongated head was made by sawing a human skull in half and casting it into the design.

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Why lying for your group can feel righteous
Psychology

Why lying for your group can feel righteous

When your group feels like part of who you are, protecting it can feel like protecting yourself. A lie for the group can then be recast as loyalty or justice,…

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A 1960s home computer occupied the basement
Technology

A 1960s home computer occupied the basement

Engineer Jim Sutherland built ECHO IV at home from surplus components. His plans included storing recipes and shopping information and controlling household…

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Finnair asked passengers to step on the scales
Transport

Finnair asked passengers to step on the scales

In 2024, volunteers at Helsinki Airport were weighed with their carry-on luggage to update flight-planning averages. The measurements were anonymous, not a…

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The Taj Mahal's white marble borrows its color from the sky
Travel

The Taj Mahal's white marble borrows its color from the sky

Low morning light can give the stone a pinkish cast, while changing daylight alters its brightness and tone. The building stays the same, but the light…

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Doom’s chainsaw sound came from a real chainsaw
Culture & entertainment

Doom’s chainsaw sound came from a real chainsaw

Developer Bobby Prince borrowed his girlfriend's chainsaw and recorded its sound for the game's weapon.

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Why Romans thought trousers were barbaric
History

Why Romans thought trousers were barbaric

To Romans, trousers marked a person as foreign and uncivilized; the toga was the respectable choice. Some emperors even banned pants in the city, treating a…

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