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Why red leaves a cyan ghost on a white wall
Health

Why red leaves a cyan ghost on a white wall

After you stare at red, the eye’s red-sensitive cone cells respond less strongly for a short time. On a white wall, the other color signals then carry more…

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When restaurants prescribed hot meat broth
History

When restaurants prescribed hot meat broth

The idea was food as treatment: a hot meat broth that someone feeling ill could sip when a full meal was too much. These restaurants offered a restorative,…

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Sliding root beers down a bar at lightning speed to patrons
Games

Sliding root beers down a bar at lightning speed to patrons

In Tapper, you play a bartender sliding mugs down four counters. Miss a glass or let a customer get too close, and you lose.

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Voicemail systems are strictly closed telephone exchanges
Technology

Voicemail systems are strictly closed telephone exchanges

In a traditional voicemail system, an unanswered call is routed to a network server, where the message is stored until the recipient retrieves it.

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Why a coffee mug and a doughnut are the same
Science

Why a coffee mug and a doughnut are the same

Topology ignores a mug’s ceramic and a doughnut’s frosting and asks one question: how many holes go all the way through? A mug’s handle makes one, just as a…

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AOL dial-up survived until 2025
Technology

AOL dial-up survived until 2025

The service finally ended on September 30, 2025, decades after its modem noises became a symbol of early home internet. Broadband made it feel obsolete long…

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Brass items loudly broadcast your energetic state
Myths & mysteries

Brass items loudly broadcast your energetic state

In astrological tradition, brass is said to amplify communication, making it a kind of metaphysical loudspeaker for your inner state.

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Brisbane CityCats move passengers along a winding river
Transport

Brisbane CityCats move passengers along a winding river

The Brisbane River bends through the city, and CityCats follow its waterway instead of trying to cut across blocks of land. Their twin hulls provide a steady…

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Phone styluses slip into couch cushions
Travel

Phone styluses slip into couch cushions

A small, smooth plastic stylus can slip from your hand and disappear into the couch cushions.

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Open-source software exposes its entire codebase freely
Technology

Open-source software exposes its entire codebase freely

Anyone can inspect, modify, and distribute the code, subject to its license. Some projects rely on volunteers to find and fix bugs.

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Why the GameCube had a giant handle
Games

Why the GameCube had a giant handle

Nintendo added the handle to make the GameCube feel like a kid-friendly game machine, while rivals marketed their consoles as sleek entertainment hubs for…

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What really makes carousel horses gallop
Technology

What really makes carousel horses gallop

An overhead offset crank drives a metal rod up and down as the carousel turns, making each horse appear to gallop.

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Goo Goo Cluster put a whole assortment into one candy
Travel

Goo Goo Cluster put a whole assortment into one candy

The Nashville confection combined caramel, marshmallow nougat, peanuts, and chocolate rather than relying on a single filling. Each bite offered chew, crunch,…

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A near-light-speed trip could make your reunion uneven
Science

A near-light-speed trip could make your reunion uneven

Your own clock still seems to tick normally as you travel near light speed. The difference shows up when you compare clocks: if you return, less time may have…

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WD-40's name is a record of failed attempts
Technology

WD-40's name is a record of failed attempts

It stands for Water Displacement, 40th formula: the successful version followed repeated attempts to get the product right. The spray also contains…

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Pseudo-Dionysius faked his identity for a millennium
Myths & mysteries

Pseudo-Dionysius faked his identity for a millennium

An anonymous Syrian philosopher’s writings shaped medieval theology under the name of Dionysius, a convert associated with the Apostle Paul. Scholars…

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Cradles act as a cosmic safety net for your bad choices
Myths & mysteries

Cradles act as a cosmic safety net for your bad choices

Astrologers describe a cradle pattern as a supportive half-hexagon of chart angles, said to cushion the consequences of risky choices.

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Malaria eradication yields massive dividends
Economy

Malaria eradication yields massive dividends

Preventing malaria costs billions, but the disease also drains money through medical bills and lost work. Avoiding those costs is why eradication can pay…

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