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TIL in the early 1900s, lead arsenate was the most widely used pesticide in the U.S. The USDA recommended it broadly and millions of acres were sprayed with it across the country to protect crops.

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8e18 TIL in the German Army, soldiers are obliged to disobey any order they think would violate human dignity. Few, if any other armies have this rule
d80y8 TIL Robert Millikan disliked Einstein's results about light consisting of particles (photons) and carefully designed experiments to disprove them, but ended up confirming the particle nature of light, and earned a Nobel Prize for that.
6EWV8 TIL there is a grizzly bear in Banff, Canada that's name is Boss; he has been hit by a train 3 times, eats smaller black bears and elk and has never cause any harm to people and lives in town.
v1PR7 TIL that 2 Chilean artists built a home entirely out of glass after their previous home was destroyed in an earthquake
BOZW TIL on British coins, the direction in which the monarch’s head faces alternates with each successive monarch.