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The Cold War bunker network beneath Beijing
Travel

The Cold War bunker network beneath Beijing

Beginning in the late 1960s, Beijing dug extensive shelters and passages amid fears of war. The work created a second layer of space below an already crowded…

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Batman’s animated shadows started on black paper
Culture & entertainment

Batman’s animated shadows started on black paper

Painting on black paper let artists build Gotham's backgrounds from darkness, giving the series its film-noir look.

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The volcano on Mars that dwarfs Everest
Science

The volcano on Mars that dwarfs Everest

Runny lava poured out and traveled across the ground, spreading wide rather than piling up into a steep cone. Repeated eruptions laid down more broad sheets…

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Moon footprints could outlast human civilization
Science

Moon footprints could outlast human civilization

A footprint stays sharp because the Moon has no wind or rain to sweep dust into it or wash it away. With no weather crew on cleanup duty, prints can last…

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California's sunshine can loom too large in imagined happiness
Psychology

California's sunshine can loom too large in imagined happiness

A 1998 study found similar overall life satisfaction among surveyed students in Southern California and the Midwest, although people expected Californians to…

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Why one small mistake can feel catastrophic
Psychology

Why one small mistake can feel catastrophic

One typo in a presentation can eclipse the ten things that went right because mistakes grab attention. Your mind treats the flaw as urgent evidence—about the…

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Why Nintendo Switch cartridges taste so bitter
Technology

Why Nintendo Switch cartridges taste so bitter

Nintendo coats the tiny game cards with denatonium benzoate, an intensely bitter substance, to discourage children from swallowing them. Curious adults have…

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Atari's classic joystick reduced a whole hand to five switches
Games

Atari's classic joystick reduced a whole hand to five switches

Inside the CX40 are four directional contacts and one for the fire button. Moving diagonally activates a combination of directions rather than a sophisticated…

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Why speeding up barely saves any time
Psychology

Why speeding up barely saves any time

Speed feels like a shortcut, but travel time is divided by speed, so each extra mile per hour buys less than you expect. On a 10-mile trip, 60 mph takes 10…

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Jack Nicholson destroyed the fake door in The Shining
Culture & entertainment

Jack Nicholson destroyed the fake door in The Shining

Kubrick's breakaway prop was too flimsy for Nicholson, a former volunteer fire marshal, who chopped through it too quickly. They switched to a solid wood door…

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When World of Warcraft had 12 million subscribers
Games

When World of Warcraft had 12 million subscribers

At the Lich King expansion’s peak in 2010, 12 million people paid a monthly subscription to play. That’s more people than lived in Greece or Ohio.

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The first driverless cars followed wires under the road
Transport

The first driverless cars followed wires under the road

A wire buried beneath the road sent a signal that sensors on the car followed, steering it along a preset route. The road became the driver, and the car just…

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Planchettes were standalone automatic writing instruments
Myths & mysteries

Planchettes were standalone automatic writing instruments

Victorian spiritualists used a heart-shaped wooden board with a pencil attached, hoping it would let spirits write messages.

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Your garage may be more dangerous to your bike
Transport

Your garage may be more dangerous to your bike

More than half of reported bicycle thefts happen in the owner's garage or shed, not on the street. A sturdy bike lock may not protect it once it's home.

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Why Earth's CO₂ levels dip every spring
Science

Why Earth's CO₂ levels dip every spring

The yearly dip is a plant-driven tug on the atmosphere. Northern Hemisphere vegetation takes up CO₂ as it grows in spring, then decay and respiration send…

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Instagram was built in just eight weeks of coding
Technology

Instagram was built in just eight weeks of coding

Systrom and Krieger pivoted from Burbn, a cluttered check-in app, to a photo-sharing app built around square filters. Instagram launched eight weeks later.

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Boggle makes you compete over the same letters
Games

Boggle makes you compete over the same letters

Allan Turoff's game gives players a shared grid of letter dice and a short time to find words. Matching words on different players' lists cancel out, so the…

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The woman who drove a Model T around the world
Transport

The woman who drove a Model T around the world

Aloha Wanderwell crossed continents in a Model T because its simple engine was easier to repair far from a garage. She carried tools and spare parts, turning…

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