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TIL that astronauts can't cry properly in space - In microgravity, tears don't fall as they do on Earth. Instead, they form a ball on the eye, which can cause discomfort.

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via reddit.com

wdj7 TIL That dolphins and whales are best buds and play mates. A dolphin will get on top of the whale’s head, then the whale tilts upwards so the dolphin can slide down into the water.
ney7P TIL that a German submarine was forced to surface and subsequently bombed, because a crew member made a mistake while using the toilet. Instead of flushing, he opened a valve that flooded the u-boats batteries, casuing them to create a deadly gas.
X0XX8 TIL a clown saved 300 children during the deadliest avalanche in history. Only 400 people survived out of around 18,000 in the town of Yungay, Peru. The children were attending a circus and a clown led them to higher ground moments before the avalanche destroyed the entire town.
a8OEL TIL that in 1997 Pope John Paul II had named St. Isidore of Seville as the patron saint of the Internet, as the seventh-century theologian and encyclopedist who wrote the sole encyclopedia for nearly a millenium around 650 AD.
16pl8 TIL the UK tradition of Fish and Chips was introduced by Spanish and Portuguese Jewish immigrants in the 16th century. It was created to allow Jews to safely eat fish cooked for Friday night dinner the following day on the sabbath, the day Judaism forbids cooking with fire or electricity.