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TIL Contrary to popular belief, the Great Wall of China is not visible from space with the naked eye.

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LQvrP TIL that Desmostylia, extinct ancestors of manatees, had a unique way of feeding: they vacuumed seagrass from the seafloor by uprooting it entirely with their mouths. This distinctive feeding method likely contributed to their extinction as they competed with other marine herbivores.
69yXZ TIL Vangelis, who did the "Chariots of Fire" soundtrack, composed nearly 12 hours of music to accompany microneurosurgery training tapes by his friend, Dr. Stergios Tegos.
W7Rmd TIL that Don Johnson met Melanie Griffith when she was 14-year-old. When she was 15 and Johnson was 23, she and Johnson began living together. On her 18th birthday they became engaged and were married in January 1976.
5VmGB TIL there have not yet been any major medical emergencies in space, but astronauts are trained to deal with them. ISS astronauts have developed a way to perform CPR in zero gravity by bracing their legs on the ceiling while pushing down on the patient on the floor below
v16gB TIL about Daniel Freeman, a Civil War veteran and the first person to claim land under the Homestead Act. Later in life, he brought up and won a landmark separation of church and state case against a teacher who was evangelizing to her students with permission from the school board.