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TIL that the summer of 1816 is called “the year without summer” due several compounding earth events lowering Earth’s temperature and eliminating summer that year.

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6Ewa7 TIL: An interesting yet unexplained phenomenon is that men have erections while dreaming (REM sleep), even when the dream is void of salacious content. The ancient cultures that believed soul flies away during dreams, typically depict dreaming by an erection and a bird flying away from the body.
EgERV TIL the Heat Index (aka "feels-like" temperature) is only accurate for healthy and well-hydrated adults of average size and weight who are sitting in the shade with a breeze of 5 knots. These and other assumptions are parameterized as constants in the formula and any deviations result in inaccuracy.
WKbL TIL the Netherlands experienced a ‘tulip mania’ in 1637. Before the bubble collapsed, a single bulb could sell for 10-times the annual income of skilled worker
E1nm7 TIL getting goosebumps from music is a rare condition that actually implies different brain structure. People who experience goosebumps from music have more fibers connecting their auditory cortex and areas associated with emotional processing, meaning the two areas can communicate better.
VMQkB TIL the Nation of Islam believes that white people were made by a black scientist named Yakub 6600 years ago. Whites were exiled to Europe, lived in caves, and were eventually drawn out by Moses. Moses tried to civilize them, but he gave up and blew up 300 of the worst with dynamite.