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Soccer's second yellow becomes a red
Games

Soccer's second yellow becomes a red

A player cautioned twice in the same match is sent off: the referee shows another yellow card, then the red. The first warning stays relevant even after the…

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Why cheap keychains break so quickly
Travel

Why cheap keychains break so quickly

Tourist keychains often have flimsy metal rings that can bend or snap before you even get your keys through the front door.

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Bill Bailey moonwalked decades before Michael Jackson
Transport

Bill Bailey moonwalked decades before Michael Jackson

Film of Bailey's dancing shows the backward glide long before Jackson made it a signature move. The illusion separates what the feet suggest from where the…

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Pet food advertising has to persuade someone who won't eat it
Culture & entertainment

Pet food advertising has to persuade someone who won't eat it

The buyer is the owner, so packaging and ads emphasize ingredients and visual cues that people find appetizing. The dog cannot compare the photograph with the…

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Screen rides are a cheap out for designers
Culture & entertainment

Screen rides are a cheap out for designers

Instead of building physical sets or animatronics, parks can strap riders into a shaking chair in front of a giant 3D screen, cutting production costs.

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How sour milk becomes biodegradable plastic
Science

How sour milk becomes biodegradable plastic

Bacteria ferment plant sugars into lactic acid; chemists then link many lactic-acid molecules into PLA, a moldable plastic. The surprising part is what…

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Fanny packs returned purely out of desperation
Travel

Fanny packs returned purely out of desperation

They returned because stuffing several heavy gadgets into your pockets is uncomfortable, especially on a long walk.

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Snorlax turns a sleeping animal into a locked door
Games

Snorlax turns a sleeping animal into a locked door

In the original Pokémon games, a sleeping Snorlax blocks your route until you obtain the Poké Flute. The obstacle looks like a creature with its own life, but…

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Some dating-show rings come with a two-year deadline
Culture & entertainment

Some dating-show rings come with a two-year deadline

Some dating shows require couples to return their engagement ring if they split within two years of the finale, making the costly jewelry conditional rather…

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Krypton strictly operates as a highly unreactive noble gas
Science

Krypton strictly operates as a highly unreactive noble gas

An electric discharge gives krypton atoms a temporary energy boost. As each atom sheds that extra energy, it releases light—no chemical reaction required.…

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How Guinness World Records makes money from records
Culture & entertainment

How Guinness World Records makes money from records

Guinness World Records charges companies to send official adjudicators to brand events, making record attempts a form of paid marketing.

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Zelda lets Link carry two servings of emergency milk
Games

Zelda lets Link carry two servings of emergency milk

In Ocarina of Time, Lon Lon Milk restores five hearts per drink, with two drinks in a bottle. That makes the bottle both a container and a small reserve of…

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The telescopes that spin liquid mercury
Technology

The telescopes that spin liquid mercury

A spinning vat of toxic liquid mercury naturally forms a parabolic reflective surface, avoiding the costly grinding required for giant glass mirrors.

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The black mold behind soda's citrus tang
Technology

The black mold behind soda's citrus tang

Manufacturers make citric acid for soft drinks by feeding sugar to Aspergillus niger, a black mold that produces the acid as it digests the sugar.

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Why flying carpets began as Persian folklore
Transport

Why flying carpets began as Persian folklore

Persian tales gave a treasured carpet the one upgrade no loom could provide: flight. A flying carpet turned a household luxury into instant transport,…

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Why mail delivery loses money on remote addresses
Economy

Why mail delivery loses money on remote addresses

A letter can bring in less postage than it costs to drive it to a remote address. The postal service still has to make the trip, because the delivery promise…

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Copper turns entirely green when it extensively oxidizes
Science

Copper turns entirely green when it extensively oxidizes

Air and moisture slowly react with copper’s outer surface, forming the green patina you see. Because that coating can protect the metal below, the change is…

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Swedish parents proposed a name that looked like a keyboard accident
Economy

Swedish parents proposed a name that looked like a keyboard accident

The rejected string Brfxxccxxmnpcccclllmmnprxvclmnckssqlbb11116 was presented as being pronounced Albin. It was part of a protest over naming rules, after the…

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