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How circuses advertised towns before the internet
Travel

How circuses advertised towns before the internet

Advance teams rode into towns weeks before a touring circus arrived and covered walls with colorful posters.

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Pat-a-cake was in print by 1698
Games

Pat-a-cake was in print by 1698

The familiar clapping rhyme appears in a late-17th-century play, giving the children's game a documented life far beyond anyone singing it today. Its rhythm…

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Tetherball poles must be exactly ten feet tall
Games

Tetherball poles must be exactly ten feet tall

There are actual standardized regulations for strapping a volleyball to a rope and smacking it around a metal pipe. The pole has to be ten feet high, meaning…

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Why schools banned Red Rover
Games

Why schools banned Red Rover

Children formed a line holding hands while another child charged at them, creating a risk of falls and injuries.

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A reed boat's buoyancy has an expiration problem
Transport

A reed boat's buoyancy has an expiration problem

Dry bundles contain air and weigh relatively little for their volume. As the material takes on water, its weight rises, leaving less capacity to support…

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Cinnamon is tree bark—literally
Economy

Cinnamon is tree bark—literally

The spice comes from the inner bark of a particular tree. Strip off the outer layer, scrape away the inner bark, and it curls into the familiar cinnamon…

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Radioactive polonium is lethal in microscopic microscopic doses
Health

Radioactive polonium is lethal in microscopic microscopic doses

Inside the body, polonium-210 releases alpha particles that damage nearby cells. Alpha radiation cannot travel far through tissue, but that offers little…

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Duckweed naturally doubles its biomass in forty hours
Economy

Duckweed naturally doubles its biomass in forty hours

That speed matters because duckweed is rich in protein and needs no soil. If it can be grown as livestock feed, its rapid growth could make it a useful…

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That green wasabi paste may be mostly horseradish
Economy

That green wasabi paste may be mostly horseradish

Real wasabi is expensive to cultivate, while horseradish can provide a sharp sensation at a lower price. Manufacturers often combine it with ingredients such…

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First indoor ice hockey game occurred in a tight rink
History

First indoor ice hockey game occurred in a tight rink

At Montreal’s first organized indoor game in 1875, players used a flat wooden block instead of a ball so it wouldn’t fly into spectators. The puck was crowd…

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Thumb wrestling has a world championship—and stage names
Games

Thumb wrestling has a world championship—and stage names

The World Thumb Wrestling Championships in Beccles, Suffolk, invite competitors to decorate their thumbs and adopt stage names. The tiny contest gets the…

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Special alloys block invisible magnetic fields
Technology

Special alloys block invisible magnetic fields

Mu-metal’s high magnetic permeability gives magnetic fields an easier path through the alloy, guiding them around sensitive equipment rather than through it.

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How a vinyl record stores stereo sound
Technology

How a vinyl record stores stereo sound

A stereo record’s single groove has a V-shaped cross-section, with the left channel carved into one wall and the right channel into the other. The needle…

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Pyongyang's huge stadium doubles as a stage for mass spectacle
History

Pyongyang's huge stadium doubles as a stage for mass spectacle

The Rungrado May Day Stadium opened in 1989 beneath 16 petal-like roof sections. Besides football and athletics, it has hosted enormous choreographed…

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When Sherlock Holmes died, fans went into mourning
Culture & entertainment

When Sherlock Holmes died, fans went into mourning

After Doyle killed Holmes in 1893, more than 20,000 readers reportedly canceled their magazine subscriptions, and some men wore black mourning armbands.…

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You can eat pure gold
Science

You can eat pure gold

Edible gold leaf passes through your gut largely unchanged because your body can’t break down or absorb elemental gold. It adds sparkle, not calories or…

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Road trips are a surprisingly modern invention
Transport

Road trips are a surprisingly modern invention

Cars made travel flexible; highways and roadside fuel stations made it practical. Suddenly, the family vacation could follow a map instead of a railway…

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Spirulina grows efficiently in highly alkaline ponds
Economy

Spirulina grows efficiently in highly alkaline ponds

Spirulina can grow in salty, highly alkaline ponds where many competing organisms can’t survive. With fewer weeds and pests to fight, farmers have an easier…

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