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Why jetboards sink when they stop moving
A hydrofoil beneath the board lifts it above the water as it moves; the flowing water over the foil supplies the lift. Stop the board and that lift…
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Anamorphic street art only looks correct from extreme angles
Artists distort the image so it resolves into a 3D scene from one chosen viewpoint; from elsewhere, the drawing looks stretched and smeared.
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Astronomers theorize the Star of Bethlehem was just a rare astrological conjunction of Venus and Jupiter
One proposed explanation is a close conjunction in 2 BC: Venus and Jupiter appeared to merge in the sky, creating an unusually bright sight. The idea remains…
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Respected psychiatrist Ian Stevenson spent forty years interviewing toddlers who claimed they died in horrible ways
Stevenson collected thousands of reports and checked children’s specific claims against details about deceased people, though the accounts did not prove…
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Furious 7 really dropped cars out of a plane
The production sent unmanned cars into free fall with parachutes, with skydiving camera operators filming the descent. Separate shots put the actors inside…
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Ancient Mesopotamians literally carved the very first recorded horoscopes onto heavy clay tablets around 410 BC
The earliest known personal examples were pressed into cuneiform clay in Babylon; rather than offering career advice, they warned whether a child was destined…
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Slurping noodles isn't a table-manners scandal in Japan
It is an accepted way to eat dishes such as ramen and soba, rather than the automatic breach of etiquette it can be elsewhere. Drawing in air also changes the…
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Talcum powder physically absorbs friction between skin folds
Fine powder particles settle between damp skin folds and reduce direct skin-on-skin contact. That makes them a dry lubricant: they help the surfaces slide…
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Why Brazil restricts travel to protect uncontacted tribes
FUNAI patrols parts of the Amazon to keep loggers, missionaries, and tourists away because outsiders can bring diseases that isolated communities have little…
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Free radicals are cellular wrecking balls
A free radical can take an electron from a nearby molecule, leaving that molecule more likely to react in turn. This chain of oxidative reactions can damage…
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Why the Ace of Spades is so ornate
The fancy design wasn’t just decoration: English authorities required a stamp showing the playing-card tax had been paid. Manufacturers put it on the top…
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Why intense envy can feel physically painful
Watching someone else get what you desperately want can feel like a punch. Envy makes a comparison personal: their success becomes evidence of the gap between…
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Arabic parts use complex fractional math to calculate incredibly specific things like sudden wealth
Astrologers calculate a Lot by adding and subtracting the degrees of three chart points; the Part of Fortune is the best-known example, associated with luck.
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Cardinal signs initiate the four seasons and use this astrological fact to justify being highly bossy
Aries, Cancer, Libra, and Capricorn mark the starts of spring, summer, fall, and winter in the zodiac, which is why astrology calls them “initiating” signs.
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Indian Ocean is the warmest body of water globally
It absorbs heat so effectively that its water can feel like a vast, warm bathtub.
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Expedited passport processing is completely unpredictable
Paying for expedited processing doesn’t guarantee a faster arrival: bureaucratic delays can leave a rushed passport arriving no sooner than a standard one.
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Brazil borders almost every country in South America
Brazil shares land borders with every South American country except two, making it the continent's near-ubiquitous neighbor.
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A suffragette slashed one of London's most famous paintings
In 1914, Mary Richardson attacked Velázquez's Rokeby Venus at the National Gallery in protest over the treatment of Emmeline Pankhurst. The museum closed to…
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Stardew Valley's Abigail talks about eating gifts that aren't food
Her generic response to liked gifts says she was hungry and calls the present delicious. That includes objects such as quartz, helping produce the running…
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Why the Zerg sound like wet squishes
The Zerg issue commands in gurgles, hisses, and squelches instead of words, so a match can sound like a bowl of macaroni being stirred.
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Palmistry became wildly popular in the nineteenth century because it gave aristocrats an excuse to touch hands
Palm readers could turn a fortune-telling session into a socially acceptable excuse to hold a debutante’s hand, sometimes flattering her with claims about an…
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Why scientists can barely gather francium
Francium is hard to collect because it decays almost as soon as it is made. Even its longest-lived known isotope loses half its atoms in about 22 minutes, so…
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Why eucalyptus trees can burst into flames
Some eucalyptus leaves contain volatile oils that can add fuel when a fire is already burning. They don't make a tree ignite by themselves; the oils can help…
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Ninth house rules foreign travel and higher education
In astrological readings, it can point to relocating abroad or pursuing higher education—sometimes at the cost of student debt.
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