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Why Tetris pieces are called tetrominoes
Games

Why Tetris pieces are called tetrominoes

Each piece is made of four connected squares; “tetra-” means four.

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Why winning an auction can mean overpaying
Economy

Why winning an auction can mean overpaying

Everyone else stopped bidding, but that doesn’t mean the winner got a bargain. With an uncertain-value item, the highest bid may belong to the most…

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Why narcissists can look like executive material
Psychology

Why narcissists can look like executive material

In a job interview or meeting, the person who talks up their strengths can seem more executive than the person quietly doing careful analysis. Narcissistic…

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Bethlem once let visitors look at patients for entertainment
Health

Bethlem once let visitors look at patients for entertainment

London's Bethlem hospital became a public spectacle as visitors came to observe people living with mental illness. Its history helped make 'Bedlam' a word for…

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What circuses taught armies about logistics
Culture & entertainment

What circuses taught armies about logistics

The precision needed to move tents, animals, and performers overnight was so useful that early industrial armies studied circus routes to learn how to move…

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Bluffing card matches thrived in dangerous saloons
Games

Bluffing card matches thrived in dangerous saloons

Players relied on bluffing and cheating as much as cards—and sometimes on drawing faster than an opponent.

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An ancient earthquake detector pointed with a falling ball
Technology

An ancient earthquake detector pointed with a falling ball

Zhang Heng's second-century Chinese seismoscope used dragons arranged around a vessel, each associated with a direction. A released ball dropping toward a…

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How MLMs use products to avoid pyramid-scheme laws
Economy

How MLMs use products to avoid pyramid-scheme laws

A physical product gives an MLM something to sell on paper, even if distributors end up with boxes of unsold stock in their garages. The product can make the…

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Bureaucracies approve paperwork for high fives
Economy

Bureaucracies approve paperwork for high fives

The patent does not just describe a machine for a novelty greeting; it gives its holder exclusive commercial rights to an apparatus designed solely to deliver…

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Rome told a story in which geese outperformed the guard dogs
History

Rome told a story in which geese outperformed the guard dogs

In the ancient account, sacred geese on the Capitoline raised the alarm as Gauls approached, allowing defenders to react. The birds became part of a story…

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Why rulers once banned chess
Games

Why rulers once banned chess

Some rulers feared chess could teach subjects strategic thinking—and even rebellion—so they banned it.

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Manipulating wooden dolls is peak prestige
Culture & entertainment

Manipulating wooden dolls is peak prestige

In avant-garde theater, puppetry can be a serious art form: performers dressed in black pull strings to make a wooden figure seem profoundly sad.

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Controlling night visions requires effort
Psychology

Controlling night visions requires effort

Trying to direct a dream is like trying to write a scene while you’re inside it. You have to hold onto the idea that you’re dreaming and keep choosing what to…

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A potato battery gets its electricity from the metals
Technology

A potato battery gets its electricity from the metals

Two different metals, such as zinc and copper, serve as electrodes while the potato provides a medium for charged particles to move. Chemical reactions drive…

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A castrato's voice survived into the recording age
Culture & entertainment

A castrato's voice survived into the recording age

Alessandro Moreschi, a singer in the Sistine Chapel choir, made recordings in 1902 and 1904. He belonged to the now-abandoned tradition of castrating boys…

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Sending cardboard squares proves you left home
Travel

Sending cardboard squares proves you left home

A postcard pairs a tiny vacation photo with a handwritten message, turning a trip into a small, portable brag delivered across the ocean.

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Treating phobias can mean facing them all at once
Psychology

Treating phobias can mean facing them all at once

A phobia can shrink when the person stops organizing life around avoiding its trigger. In an intensive exposure session, they face it for long enough to…

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The typo that brings tourist traps free publicity
Travel

The typo that brings tourist traps free publicity

Some roadside businesses deliberately misspell words on billboards, counting on travelers to photograph and share the joke—and give them free publicity.

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