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TIL astatine is the rarest naturally occurring element. It is estimated there is no more than one gram in the Earth’s crust at any given time.

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rRnpy TIL That a Paypal Error Led to The World’s First “Quadrillionaire”
vBLR TIL The First person in Britain to be eaten by a Tiger was a Barmaid in 1703
9Y0wm TIL In 1936 BBC broadcasted television using a mechanical spinning disc transmitter and display with a peak resolution of 240 lines. The mechanical system did not scan the televised scene directly, instead a 17.5 mm film was shot, rapidly developed and then scanned while the film was still wet.
LQ6rr TIL about FADs (fish aggregating devices), which are man-made floats or buoys tethered to the ocean floor. Fish are fascinated with and aggregate in considerable numbers around floating objects which provide a “visual stimulus in an optical void.” 1/3 of global tuna are caught using FADs.
KOrQB TIL that "potter's field," a term synonymous with mass graves, has a Biblical origin. It refers to an extremely clay-rich parcel of land in Jerusalem, purchased with the 30 pieces of silver which Judas returned to the chief priests. Useless for farming, the land was used to bury strangers.