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TIL that a brain can be large but made of relatively few neurons if those neurons are huge, like in an elephant; primate neurons are small, and bird neurons are even tinier.

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oBkDE TIL a man who was paralyzed from a surfing accident neck injury was able to walk again from an experimental treatment. Stem cells from the man's own stomach fat were injected into his spinal cord to regenerate and repair the injury.
AQ1n TIL the abbreviated title “Mrs.” isn’t actually derived from the word “missus”, but rather from “mistress” instead. Addressing a woman as a mistress used to be considered a courtesy, until the term took on the less-dignified meaning we know it by today.
rRopd TIL Microsoft Excel can reach down to 1,048,576 rows. A YouTuber spent over 9 hours holding down the down key
bvJQ TIL that after needing 13 liters of blood for a surgery at the age of 13, a man named James Harrison pledged to donate blood once he turned 18. It was discovered that his blood contained a rare antigen which cured Rhesus disease. He has donated blood a record 1,000 times and saved 2,000,000 lives.
VMpQ4 TIL of Luz Long - German competitor against Jesse Owens in the 1936 Olympics. Owens was later quoted saying " You can melt down all the medals and cups I have and they wouldn't be a plating on the twenty-four karat friendship that I felt for Luz Long". Owens was the best man at his son's wedding.