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TIL, Since 2007, all of McDonald's delivery trucks in the UK have been fueled by used cooking oil from their restaurants.

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bv80 TIL Jacob Appelbaum, a man who has been repeatedly targeted by US law enforcement agencies for his work with Wikileaks, was once detained by US Customs; they searched him for phones or laptops but found only flash drives with The Bill of Rights encoded in them. They were unable to copy them.
0dAep TIL above Olive Riley, a blogger who posted over 100 videos on Youtube documenting her life through WWI, the Great Depression, and WWII. She was born in 1899 and died in 2008. Her videos are still public today.
5YW9D TIL that Julius Caesar almost started his career as a priest, which would have forbidden him from touching a horse, sleeping one night outside of Rome, or looking upon an army
b6ZL9 TIL about the world's rarest bird that was thought to be extinct for nearly 80 years until it was rediscovered in 2013. Only 3 individuals of the species are known to exist in the wild.
xyYb TIL as a graduate student at UC Berkeley, mathematician George Dantzig showed up late to a statistics class and mistook two famously unsolved statistics problems as a homework assignment. He solved them and turned them in a few days later, believing his assignment was overdue.