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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.

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x6LJw TIL That In 1996 during an SAS training exercise 21 year old Bear Grylls broke his back after falling from 16,000 feet due to a torn parachute. 2 years later he climbed Mt. Everest becoming the youngest Briton to reach the world's highest peak at the time.
RW56 TIL the Amphitheatre of Pompeji, the first one the Romans built out of stone in the 1st cent. BCE, still offers valuable and relevant lessons to crowd control specialists in the creation of modern venues
nybB TIL that Futurama has had four designated series finales, due to the recurringly uncertain future of the series. “The Devil’s Hands Are Idle Playthings”, “Into the Wild Green Yonder (Part 4)”, “Overclockwise”, and “Meanwhile” have all been written to serve as a final episode for the show.
jNVPM TIL the reason Samuel L Jackson asked for a purple lightsaber was so that he could find himself on-screen in the Battle of Geonosis (Attack of the Clones) among the dozens of other Jedi.
vPYyr TIL ancient writers thought geese and ocean barnacles were the same creature