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TIL the peak output of a horse can reach nearly 15 horsepower

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x6aA1 TIL most audio recordings contain a background "mains hum" from electric power grid oscillations that can be matched with grid readings to date the clip to the second it was recorded.
Ypj97 TIL There’s over a dozen species of kangaroo that live in trees.
M7QMb TIL the oldest known Earth rock was not discovered on Earth, but was a meteorite found on the moon
8aZVL TIL that in order to aid recruitment during WWI, the British allowed men from the same town to serve together in "pals battalions". This was stopped after the Battle of the Somme, in which casualties were so high amongst some units that almost the entire male population of some towns was wiped out.
neVKP TIL In the 1950s and 60s, a Montreal hospital subjected psychiatric patients to electroshocks, drug-induced sleep and huge doses of LSD on behalf of the CIA's pursuit of mind control. It was part of MK ultra