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A microscopic silver layer makes mirrors work
Technology

A microscopic silver layer makes mirrors work

A thin layer of silver on glass reflects visible light because the metal’s free electrons repel incoming electromagnetic waves.

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Coal is transported through massive slurry pipelines
Transport

Coal is transported through massive slurry pipelines

Coal is crushed into small particles and mixed with water, making a slurry that pumps through a pipeline. At the destination, the coal is separated from the…

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Burning chemicals reveals their deepest elemental secrets
Technology

Burning chemicals reveals their deepest elemental secrets

Each element emits or absorbs light at characteristic wavelengths. A spectrometer reads that pattern like a barcode, helping chemists identify what a sample…

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Your center of mass can float in empty space
Science

Your center of mass can float in empty space

A ring’s mass sits around its rim, but the opposing sides balance at the empty center. Physicists call that invisible balance point the center of mass and use…

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Your passport belongs to the government
Travel

Your passport belongs to the government

In many countries, a passport remains government property even while its holder carries it; the issuing authority can revoke it or demand its return.

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An arm-wrestling trophy can cost as much to win as it pays
Economy

An arm-wrestling trophy can cost as much to win as it pays

In a profile of champion Allen Fisher, his wife Carolyn described trips costing about $500 when first prize might be $500 or $600. They sometimes entered…

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Liszt fans fought over his cigar butts
History

Liszt fans fought over his cigar butts

At concerts, aristocratic women fought over broken piano strings and Liszt’s discarded cigar butts, which they wore in lockets. His celebrity was so intense…

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Hotels match identification to credit cards
Travel

Hotels match identification to credit cards

Some hotels require the cardholder's name to match the guest's to help prevent fraud, which can complicate paying for someone else's stay as a gift.

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Walt Whitman secretly reviewed his own poetry
Culture & entertainment

Walt Whitman secretly reviewed his own poetry

After publishing “Leaves of Grass” in 1855, Whitman anonymously submitted three glowing reviews of his own book to local newspapers, describing himself as a…

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Kurt Schwitters built a sculpture that swallowed his studio
History

Kurt Schwitters built a sculpture that swallowed his studio

Beginning in the 1920s, Schwitters kept expanding his Merzbau in Hannover until the construction occupied much of his working space. It was an environment to…

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Refrigerated trailers maintain freezing temperatures
Transport

Refrigerated trailers maintain freezing temperatures

A reefer trailer is an insulated box with its own refrigeration unit, which chills and circulates air around the cargo. The truck hauls the food; the little…

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Kant's punctuality became part of his public legend
History

Kant's punctuality became part of his public legend

Biographer Reinhold Jachmann recalled neighbors judging whether it was seven by whether Kant had passed after visiting a friend. Heinrich Heine later helped…

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Forcing twisted light waves to reveal molecular handedness
Technology

Forcing twisted light waves to reveal molecular handedness

A polarimeter sends polarized light through a substance and measures whether it rotates left or right—a clue to whether its molecules are chiral.

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Rousseau's book on raising children followed his own abandonment of five
History

Rousseau's book on raising children followed his own abandonment of five

Before publishing Emile in 1762, Rousseau had sent his five children to a foundling institution. He later defended and revisited that decision in his…

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The PlayStation 2 that could record live TV
Games

The PlayStation 2 that could record live TV

The PSX combined a PlayStation 2 with a TV recorder, using a built-in hard drive to save live broadcasts. Its high price kept it from becoming a mainstream hit.

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Wagner's conductor premiered Tristan while his wife was involved with Wagner
History

Wagner's conductor premiered Tristan while his wife was involved with Wagner

Hans von Bülow conducted the 1865 premiere of Tristan und Isolde. His wife Cosima had already begun a relationship with Wagner and later married him.…

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Schubert wrote over 600 songs in a life of just 31 years
History

Schubert wrote over 600 songs in a life of just 31 years

Much of his music grew around a circle of friends in Vienna rather than a grand public career. His surviving work includes hundreds of songs alongside…

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Two bright lights can create darkness
Science

Two bright lights can create darkness

When two light waves meet out of step, a peak from one can line up with a trough from the other and cancel, making a dark patch. The energy hasn’t vanished;…

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