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TIL a Polar bear attacked a US Submarine when it broke through sea ice in 2003

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Wk019 TIL that in 2014, astronomers discovered an Unusual Supernova that has been continually exploding since the 1950's. No theory exists that explains why this supernova eruption has lasted hundreds of times longer than typical supernovae eruptions, which usually last about 100 days.
6EBm8 TIL exocannibals eat people from outside their social group, while endocannibals eat members of their own community
mx9go TIL that your own voice seems lower to you because its mostly transmitted through skull, and bone conduction transmits low frequency sound better
5VVEk TIL wet cement can cause chemical burns
LkgJQ TIL the Aztecs made swords embedded with prismatic obsidian blades that are far sharper than even high quality present day steel razor blades.