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TIL Batman was originally going to have blond hair, a small domino mask, and no desire for a secret identity. It resembled nothing like a bat and nothing how we know Batman today. Thankfully, Bill Finger stepped in and added some major changes to resemble the legendary Batman, we know today

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r76M TIL there’s a line of 70 foot long concrete arrows that bisects the country longitudinally all the way from San Francisco to New York City. They’re from the pre-digital age and were installed by the Federal gov’t in 1924 with 50’ tall towers with rotating gas-powered lights to aid lost pilots.
9AV6 TIL that Theodore Roosevelt III was the only General on D-Day to land by sea with the first wave of troops. At 56, he was the oldest man in the invasion, and the only man to serve with his son on D-Day at Normandy
eKag TIL in 1954 the US Government launched Operation Wetback, a mass deportation of illegal mexican immigrants.
OoMl7 TIL of radiosynthesis, a process like photosynthesis that uses the pigment melanin to convert gamma radiation into chemical energy for growth. Radiotrophic fungi were discovered in 1991 in and around Chernobyl Nuclear Power Plant.
Z8y9B TIL that when the Apollo 11 astronauts landed on the moon in 1969, they left behind a white pouch containing a silicon disc slightly bigger than a silver dollar. Inscribed in microscopic font on the disc are 73 messages, each from a different country, expressing wishes of goodwill and peace.