› added 5 years ago

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TIL Chinese mathematician Zhang Heng invented a seismometer in 132 CE which was used to detect an earthquake 250 miles away

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loKoG TIL: Hebrew was a dead language for about 1400 years, surviving only in written form. In the 1880s, Jewish linguists attempted to revive it, standardizing and developing Hebrew as a spoken language. Today, it has over 5 million native speakers.
mrOO TIL The NORAD Santa Tracker started as a typo in a Sears ad that listed the number to the RED PHONE at Air Defense Command as Santa’s Hotline and a Colonel that played along.
R79JQ TIL dogs wag their tails with a right bias in positive situations and with a left bias in negative situations.
4kVaJ TIL: Sperms were thought to move by wiggling their tails side-to-side, like eels, for 350 years. But research shows that they roll as they move forward like a spinning top.
Z86EB TIL Introverts prefer to use a different neurotransmitter called acetylcholine (rather than dopamine as used by extroverts). Like dopamine, acetylcholine is also linked to pleasure; but it powers our abilities inwards, i.e to think deeply, reflect, and focus intensely on one thing for a long time.