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TIL the term Guerrilla Warfare was coined during the Peninsula War (Napoleon era - 1807-1814) and is a reference to the Spanish word "guerrilla" (little war) which was used to refer to the partisans fighting against the French.

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epa44 TIL the Bruce effect, or pregnancy block, is the tendency for female rodents to terminate their pregnancies following exposure to the scent of an unfamiliar male. The effect was first noted in 1959 by Hilda M. Bruce and has primarily been studied in laboratory mice.
kOXPW TIL that Spotify's logo is crooked.
oeML TIL a “dash” is 1/8 of a teaspoon, a “pinch” is 1/16 of a teaspoon, and a “smidgen” is 1/32 of a teaspoon.
16oRW TIL that sewage treatment plants are not currently designed to remove pharmaceutical drugs from water. Nor are the facilities that treat water to make it drinkable. The aquatic life, particularly fish, are shown that estrogen and chemicals that behave like it have a feminizing effect on male fish.
x6LRo TIL that a Formula 1 car can brake from 100 mph to 0 faster than it can accelerate from 0 to 100 mph.