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Aquamarine is just pale and washed out beryl
Myths & mysteries

Aquamarine is just pale and washed out beryl

Aquamarine is a pale-blue variety of beryl, the same mineral family as emerald.

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Earth elements demand an invoice for emotional labor
Myths & mysteries

Earth elements demand an invoice for emotional labor

Earth signs are portrayed as practical: they may offer support but expect favors and effort to be reciprocated.

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The Berlin Wall was a system of barriers, not one wall
Travel

The Berlin Wall was a system of barriers, not one wall

In many sections, two walls enclosed a guarded strip with obstacles, patrol routes and watchtowers. Getting over one barrier could leave an escapee exposed…

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The crowded neighborhood that changed Pluto's status
Science

The crowded neighborhood that changed Pluto's status

A planet “clears” its orbit by using gravity to gather up, absorb, or fling away most nearby objects—not by leaving a spotless ring of empty space. Pluto…

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Your pillow can look clean and still need washing
Health

Your pillow can look clean and still need washing

A pillowcase collects skin oils, sweat, and shed skin while you sleep. Much of that buildup is invisible, so a fresh-looking surface tells you little about…

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Why programmers use names like Foo and Bar
Technology

Why programmers use names like Foo and Bar

Programmers use “Foo” and “Bar” as generic placeholder names for data or examples. They have no special meaning, so beginners don’t need to treat them as…

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The cafés where you pay to be ignored by cats
Economy

The cafés where you pay to be ignored by cats

The entry fee buys access to the café and its rescue cats, not a cat’s attention. You can pay to sit beside one and still spend the visit being ignored.

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Victorian vegetables were brightened with poison
History

Victorian vegetables were brightened with poison

To make canned peas and pickles look freshly green, Victorian manufacturers added copper sulfate. The color came back; so did the poison.

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Dividing vegetables into yin and yang for cosmic balance
Myths & mysteries

Dividing vegetables into yin and yang for cosmic balance

In macrobiotic eating, foods are classified by yin and yang qualities, and meals are planned to balance them. A plate of vegetables becomes part of a broader…

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Triangles maintain perfect rigidity under intense strain
Science

Triangles maintain perfect rigidity under intense strain

A square can lean into a diamond because its corners can shift while its sides stay the same length. A triangle has no such wiggle room: changing its shape…

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Radar systems work by timing returning radio wave echoes
Science

Radar systems work by timing returning radio wave echoes

Radar sends out a radio pulse and listens for the echo that bounces back from an object. Because the signal makes the trip out and back, the system halves the…

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What a hand-crank radio is really doing
Technology

What a hand-crank radio is really doing

Turning the crank drives a small generator that produces electricity for the radio.

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Domino's paid towns to fill potholes
Transport

Domino's paid towns to fill potholes

Domino’s Paving for Pizza campaign gave grants to towns to fill potholes, then put the company’s logo on the repaired pavement.

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Why ancient Egyptian ships struggled to sail upwind
Transport

Why ancient Egyptian ships struggled to sail upwind

An Egyptian ship’s broad square sail worked best with wind behind it, not coming from ahead. Sailors heading upwind relied on oars or waited for favorable…

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Culture & entertainment

Iron Man was once a B-list hero

Marvel turned to Iron Man for its 2008 film launch after selling the movie rights to better-known heroes such as Spider-Man and the X-Men.

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Lord Byron turned a found skull into a drinking cup
History

Lord Byron turned a found skull into a drinking cup

Byron said a gardener uncovered the skull at Newstead Abbey, and he had it made into a vessel for wine. He even wrote a poem for it. The macabre object was…

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A mountain train can climb by biting into a rail
Transport

A mountain train can climb by biting into a rail

On a rack railway, a toothed wheel under the train engages a matching rack between the running rails. That positive grip lets it tackle slopes where ordinary…

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The roller-skate brake that helps launch jumps
Transport

The roller-skate brake that helps launch jumps

The toe stop grips the floor, giving a skater something solid to push against when springing into a jump. The part called a brake becomes a launch pad: roller…

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