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TIL of Benjamin Lay, a radical abolitionist Quaker from 19th c. PA. He lived in a cave, ate only vegetables & fruit, & threatened slave-owning Quaker's with God's wrath. Also he was a hunchback dwarf.

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GAxw1 TIL In the 1930s, Brooks Walker invented a "fifth wheel" that was used to aid cars in parallel parking. The wheel extended down at the back, perpendicular to the rear wheels, and could swivel like the front wheel on a bicycle.
7rO97 TIL Dmitri Mendeleev, a Russian chemist and teacher, devised the periodic table. In 1867, one day after working for three straight days, he got the inspiration from a dream: "Awakening, I immediately wrote it down on a piece of paper.” He named his discovery the “periodic table of the elements.”
yXbp TIL that poison dart frogs raised in captivity are completely nontoxic. This is because they do not manufacture their own toxins. Instead, they simply concentrate toxins found in the insects they eat. When fed nontoxic insects, they cannot obtain the toxins, rendering them completely harmless.
aw1aL TIL in psychology "cognitive dissonance" requires distress from the incompatible ideas. The distress, if it results from incompatible ideas, is what's theorized to cause one to resolve the contradiction, if one is not distressed they are unlikely to be motivated to reduce the cognitive dissonance
KOW1B TIL The Florida State Seminoles is not a mascot. Instead, the University calls themselves “Seminoles” in honor of the Native American tribe. The name is supported and endorsed by the tribe, and the University and tribe share a special relationship.