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TIL: about the Transcontinental Airmail Route. A series of huge, bright yellow, illuminated, concrete arrows, built in the 1920s. They were every 10 miles and followed to enable night flying. A lot of these concrete arrows, now cracked and aged, still exist across America.

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dDRk9 TIL that, since the ovaries and fallopian tubes are not actually connected, it's normal for substances entering the uterus to spill out into the abdominal cavity at the mouths of the fallopian tubes. This includes semen, but also X-Ray contrast dye - and it's used diagnostically.
l6AA TIL the Rhinoceros Party was a registered party in Canada during 1960s to 90s, led by Cornelius, a rhinoceros, and promised to repeal the law of gravity and change Canada’s currency to bubble gum, so it could be inflated or deflated at will.
YpE7A TIL Prisoners are counted by the census as residents of towns in which they are jailed. Dramatically distorting those communities representation at local and state levels.
XE6Er TIL in the 1950's nuclear bomb tests at the Nevada Proving Grounds were often a Las Vegas attraction. You'd be able to see the mushroom clouds and feel the massive seismic shock waves produced by the bombs.
woJNE TIL about Alejo Garza Tamez, a 77 year old rancher in Mexico. In Nov 2010 members of the Los Zetas cartel demanded he leave his property within 24 hours. Instead, he told his workers to go home, gathered all of his weapons, and mounted a one-man defense, killing 4 cartel members and incapacitating 2