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TIL the DSV Alvin is a ship of Theseus, with every component having been replaced over the last 58 years of service. It has been used to explore hydrothermal vents, the Titanic, and the Deepwater Horizon oil spill. One time a swordfish attacked it. The fish was later cooked and eaten.

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A8ga TIL Each silk strand in a corn on the cob connects to an individual kernel of corn.
7GMX TIL: The province of Alberta, Canada has border guards dedicated to keeping rats out. They plant poison and dig up individual burrows. The entire province is rat-free, and rats are only allowed in zoos.
VMQrp TIL that in addition to temperature control, spacesuits are white so astronauts are easier to spot against the darkness of space
QNKAE TIL The Victorian men used the special teacup to protect their mustache from dunking into their tea.
wLR8W TIL learned about "Ether Frolics" A social gathering in the early 19th Century where partygoers would congregate to sniff ether. It was cheaper than alcohol and easier to come by than nitrous oxide, another favorite.