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TIL that Black Holes were first theorised to exist by John Michell in 1783, but the idea was ignored until it was rediscovered in the 20th century. Michell died in 'quiet obscurity'.

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8exxP TIL that in Maoiri folklore, in an attempt to give humans immortality, Maui died after turning into a worm and getting bitten in half by the teeth of a goddess' vagina
aL1Z TIL that researchers are studying fireflies to increase LED output. The study of the glowing mechanism of fireflies has helped increase LED output by 55% so far.
gJKL TIL of the cesium test. To test if an old bottle of wine is genuine it is tested for cesium 137. If there is none present, the bottle predates 1945 and the nuclear age.
Mjjb TIL According to researchers, there will be no seafood left to catch by 2048, except for jellyfish, which will thrive in the new, collapsed ecosystem.
5Adp TIL Hawaii is the most geographically isolated land mass in the world. Over 90% of the native terrestrial plants and animals are unique to the islands. This level of endemism surpasses all other places on Earth— even the Galapagos Islands.