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TIL Doubly labeled water is water in which both the hydrogen and the oxygen have been partly or completely replaced with an uncommon isotope of these elements for tracing purposes. In particular, DLW can be used to measure the average daily metabolic rate of an organism over a period of time.

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7r4Z7 TIL the most powerful volcanic eruption in the last 7,000 years, on the Indonesian island of Lombok, led to a global mini-ice age that contributed to the disappearance of the Greenland Vikings
yV558 TIL about James Jakob Williams: An African-American marine that - after fighting in the Second Barbary War (1815) - traveled to Greece where slavery had been abolished. There, he fought for the liberation of Greece from the Ottoman empire. He died in 1829: a free man, in a free Greece.
vP5WL TIL Pizza Hut hired alternative rock band Ween to produce jingles for their stuffed crust pizza line in 2002. Ween produced six demos, including "Where'd the Cheese Go", all of which were immediately rejected.
jNl1Q TIL: Pierce Brosnan could have played James Bond earlier in The Living Daylights but had to return to Remington Steele because it got popular due to Brosnan's offer to play James Bond. Timothy Dalton was given the role instead.
oRyW TIL that 1 out of 100 Germans is genetically immune to the HIV virus.