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TIL of catastrophism, a 19th century geological school of thought which saw the large fossil record as evidence proving the existence of a world previous to ours, destroyed by sudden natural catastrophes such as great floods and the rapid formation of major mountain chains.

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P1N5e TIL Australian James Harrison learned that his blood contained a rare antibody capable of treating Rhesus disease, a condition causing miscarriages and infant deaths. Over six decades, Harrison's plasma donations are estimated to have saved over 2.4 million babies.
6EGOJ TIL that the Ichthys symbol, commonly referred to as the ‘Jesus fish’, is actually the vesica piscis , which is an 'almond shaped oval defined by two arcs and symbolizes the vagina’, used by Greeks, Romans and other pagans.
PWPO TIL that farmed salmon actually has white flesh because they don’t get to eat much krill and shellfish. Salmon farmers add the organic pigment that causes the orange flesh in wild salmon, astaxanthin, to the salmon’s feed because consumers are reluctant to purchase white-fleshed salmon.
x61kB TIL Helsinki, Finland was used to film many Cold War era Hollywood movies when filming in the USSR was not possible. Examples include The Kremlin Letter (1970), Reds (1981), and Gorky Park (1983).
oeOo TIL Axl Rose’s original concept for the Sweet Child o’ Mine music video was to depict a drug trafficker carrying her child into a foreign country. It would then be revealed the child was dead and full of heroin.