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TIL: Supernova Stars observations have been used to derive a mean rate of supernova per century. The total Galactic Supernova rate is found to be 3 ± 1 per century.

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4RoN TIL the “2-3 months salary” a guy should spend on a engagement ring was a marketing campaign by diamond mining company De Beers
d8DD7 TIL in 1979, GIGN commandos briefly converted to Islam to advise and assist Saudi counterterror teams in seizing the Grand Mosque in Mecca, infidels not being permitted to step foot in the Holy City - the mosque had been taken over by an estimated 300 - 600 militants
Ygbd TIL 50% of Earth’s internal heat is from radioactive decay. Earth used to be hotter, before elements with shorter half-lives were depleted.
BnWK TIL Blue food coloring has been shown to improve recovery from spinal cord injury when injected into the spine of rats.
D1XNV TIL that sloths do not fart. They reabsorb the gas into their blood and let one rip through their mouths. They also use the trapped gas to float on water.