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TIL that just less than a century ago, astronomers weren't sure that the universe expanded beyond the Milky Way. Edwin Hubble (for whom the Hubble telescope was named) definitively proved the universe was far more vast.

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pLvA TIL Pentagon freaked out in the 1980s when they realized Finland had, against their expectations, managed to build two Mir submarines capable of diving to 6000 meters. They went on to shut down the whole Finnish submarine industry by privately threatening the country with heavy sanctions.
X0o6D TIL cockroaches can survive radiation because their cells don't divide constantly like human's. "Cells are most sensitive to radiation when they are dividing" and a cockroach molts at most once a week.
WkWj9 TIL Fred Savage was the first person to host Saturday Night Live who was born after the show’s premier in 1975. He was 13 when he hosted in 1990.
ne6Kr TIL following the attack on Pearl Harbor, Walt Disney Studios was taken over and converted by the U.S. Army into an anti-aircraft base in fears that Japanese bombers would soon reach Los Angeles. It remained the only time a Hollywood studio came under military occupation in history.
9Ow6 TIL Emma Watson almost wasn’t Hermione in the Half-Blood Prince. She had considered not returning but decided that she wouldn’t be able to watch someone else play Hermione.