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TIL that trilobites, the ancient ancestors of lobsters, had eyes made of calcite crystals.

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OGDpa TIL of Joan Deebank, British Columbia's oldest high school graduate at 92 years old. In 1939, her parents forced her to drop out. She became a maid, served in the British Army, emigrated to Canada, and had four children before re-enrolling in an adult program
Ryww TIL people on the Solomon Islands have a gene that causes blonde hair, despite their dark skin. This gene is unrelated to the one that causes blondeness in European peoples and evolved independently.
X0VAX TIL The first email was sent by a young engineer named Ray Tomlinson to himself in 1971. He was simply "fooling around" for something to do with ARPANET - a network that connects various research organizations in United States. That curiosity led to his induction to Internet Hall of Fame on 2012.
awM4L TIL that in 2006 after a man shot 10 Amish children then committed suicide, the Amish went to the his family to offer them support. They also set up a charitable fund for his family and during the shooter's funeral they surrounded the family to provide them privacy from the media.
e0Wb5 TIL that Longyou Grottoe, which are no less than 2,000 years old, represent one of the largest underground excavations of ancient times. Scientists from around the world have absolutely no idea how they were built, by whom, and why.