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TIL British grenades in WWI originally had a timer of seven seconds, but that was found to be too long as it gave the Germans time to throw the bomb back. Therefore, the time was reduced to four seconds.

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5Vdek TIL that pet food taste tester is an actual job that people do
M7rbK TIL that Humans Have Shifted Earth’s Axis by 1m by Pumping Lots of Groundwater
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L1lm TIL that the Montreal bus system has a “between stops” service, allowing women traveling alone late at night to stop between designated bus stops.
p8nYe TIL: Alan Shepard pulled out a makeshift six-iron he smuggled on board Apollo 14 and hit two golf balls on the lunar surface, becoming the first -- and only -- person to play golf anywhere other than Earth.