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TIL An explorer once found a compound, calanolide A, in certain trees in the Malaysian rainforest. Researchers found out that it has anti-HIV properties, but they couldn’t find another sample for nine years as almost all the tree of that species had been cut down for firewood and building material.

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wDD6 TIL On A Scale of the Smallest to Largest Measurable Distances, the Planck length & the Observable Universe, the Logarithmic mid point is a human brain cell. That is, a neuron is as many Planck lengths wide as the universe is neurons across.
69e0Y TIL that nearly everyone mispronounces Chico Marx' first name (one of the famous Marx Brothers) as "Cheek-Oh" when it's actually pronounced "Chick-Oh". He earned the nickname as the brother who was always chasing after the "chicks" (slang for girls).
aw4GA TIL 'Friends' (NBC, 1994) was nearly a ripoff of 'Living Single (Fox, 1993) - albeit a really good one. 6 white friends in Manhattan vs 6 black friends in Brooklyn with similar themes across episodes.
NOM TIL that when looking at a rainbow the angle between the tip of your shadow and the top of the rainbow will always be 42°.
Bgg1K TIL Frank Abagnale, of Catch Me if You Can fame, exaggerated/fabricated much of his crimes. Abagnale claims to have escaped a prison he was never in, to have been on the 10 most wanted list, and he cashed $2.5 million in bad checks but he was convicted on a total of less than $1,500 in bad checks.