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Application caches regularly cause sites to display
Science

Application caches regularly cause sites to display

A browser may keep an old stylesheet—a saved set of instructions for a page’s appearance—even after the website has changed. Then the new content arrives…

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Why a Sudoku puzzle needs at least 17 clues
Games

Why a Sudoku puzzle needs at least 17 clues

A standard 9-by-9 Sudoku needs at least 17 clues to have a unique solution; no 16-clue puzzle can do so.

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Harvest Moon lets you marry the creature in the lake
Culture & entertainment

Harvest Moon lets you marry the creature in the lake

In More Friends of Mineral Town, the kappa is a secret marriage candidate. Giving him cucumbers is only part of a demanding set of requirements. The game…

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Xbox 360 storage drives require proprietary enclosures
Games

Xbox 360 storage drives require proprietary enclosures

The drive itself was a standard laptop drive, but it sat inside a restrictive custom shell. Replacing it meant opening the casing, which could void the…

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Why your hands and feet hold over half your bones
Health

Why your hands and feet hold over half your bones

Your hands need to shape a grip, and your feet need to flex and steady you as you move. Their many small bones form intricate, adjustable frameworks for those…

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Your fingers can detect texture far smaller than a fingerprint ridge
Health

Your fingers can detect texture far smaller than a fingerprint ridge

In an experiment, people distinguished surfaces with wrinkles only about 13 nanometers high. Sliding over the pattern changes friction and vibration, giving…

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Air signs overthink themselves into complete paralysis
Myths & mysteries

Air signs overthink themselves into complete paralysis

Their stereotype is to run through dozens of hypothetical outcomes—even a sandwich order can become a 45-minute decision.

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First synthetic plastic was made from plant cellulose
History

First synthetic plastic was made from plant cellulose

Early plastics such as celluloid were made from plant cellulose rather than petroleum. Celluloid was moldable and transparent, but highly flammable.

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Where massive SUVs actually spend most of their time
Transport

Where massive SUVs actually spend most of their time

Most giant SUVs spend their days on ordinary roads, making ordinary trips, then squeezing into parking spaces designed by someone with a sense of humor. Their…

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Why you spot everyone else's biases but your own
Psychology

Why you spot everyone else's biases but your own

It’s easy to spot a rival’s blind spot because you can watch their choices from the outside. Your own bias comes wrapped in reasons that feel sincere, and you…

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Push notifications interrupt routines with trivial updates
Culture & entertainment

Push notifications interrupt routines with trivial updates

Apps can interrupt you with alerts about mundane events, like someone you haven't spoken to in years going live.

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Dutch van der Linde lost his father in a brutal war
Games

Dutch van der Linde lost his father in a brutal war

Dutch’s hatred of structured government is traced to his father’s death in the American Civil War. He went on to form an armed gang and preach loyalty and…

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How honeymoons began with abducted brides
History

How honeymoons began with abducted brides

The groom hid with his abducted bride until her family stopped searching, turning a forced disappearance into the ancestor of a romantic getaway. The original…

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How hedge funds use satellite images to predict sales
Economy

How hedge funds use satellite images to predict sales

Before Walmart and Target report sales, some hedge funds count cars in their parking lots from satellite images. A busy lot gives investors an early clue…

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When travelers made luggage from old rugs
Transport

When travelers made luggage from old rugs

Thick carpet fabric made sturdy bags that handled rough travel better than flimsy cloth. Travelers turned old rugs into luggage, so the baggage carousel once…

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The Underground tried classical music as crowd control
Transport

The Underground tried classical music as crowd control

London stations played classical recordings as part of efforts to discourage antisocial behavior. The idea was to change who wanted to linger, not merely…

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Luminous mind claims your default state is entirely glowing
Myths & mysteries

Luminous mind claims your default state is entirely glowing

The idea is that anger, ignorance, and suffering are temporary obscurations over an inherently clear, pure mind—like smudges on a bright windshield.

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Vegemite is a thin-spread food with a spoonful reputation
Travel

Vegemite is a thin-spread food with a spoonful reputation

Its concentrated salty, yeasty flavor is usually balanced by a small amount on buttered toast. A thick serving changes that balance dramatically. For an…

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