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TIL when female manta rays are ready to mate they release pheromones that attract males. This leads to a "manta train" which is when multiple male mantas follow behind a female in hopes of mating with them. This can last for weeks until the final male mantas remain.

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m7YE TIL: the bikini swimsuit was named after the nuclear explosions that destroyed Bikini island. The inventor wanted to imply the bikini was as momentous an invention as the new bomb. This was a time when beautiful women were “bombshells” and anything cool was “atomic.”
8bMb TIL: A guy built a Twitter bot that entered, and won, around 1,000 online contests over the period of 9 months.
KY9bE TIL that Alexander Selkirk, the castaway thought to have inspired 'Robinson Crusoe', sailed with and was later rescued by William Dampier, an explorer whose voyages partially inspired 'Gulliver's Travels'
wLRV1 TIL At age 24, George Ellery Hale revolutionized solar observations with his invention of the spectroheliograph, making it possible to photograph the sun's prominences in full daylight. A spectroheliograph can tune-in to gases such as hydrogen and calcium, and photograph specific solar details
b91mQ TIL roller coasters use three sets of wheels to keep the trains on the track. Running wheels which are on top of the rails, side friction wheels which are on the side of the rails, and up-stop wheels which are under the rails. This is why inversions and negative-g moments are possible.