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TIL in 1984 an 8 year old girl with sickle cell disease developed acute myeloid leukemia. To treat the cancer, the doctors gave her chemo and a stem cell transplant from her sibling. Not only did this cure her cancer, but it cured her SCD too. She remains disease free nearly three decades later.

Read more ncbi.nlm.nih.gov

via reddit.com

ADyel TIL about the Montreal Protocol of 1987, which is the only environmental treaty signed by every country in the world to stop the depletion of the ozone layer. Thanks to the treaty, 98% of ozone-depleting substances have been phased out and 2 million people are saved from skin cancer each year.
aNO0 TIL that Debra Oberlin, a former president of a defunct chapter of Mothers Against Drunk Driving (MADD), was arrested for drunk driving.
vEEj TIL that Timothy Leary, upon his arrival at prison in 1971, was given a battery of psychological tests designed to aid in placing inmates in jobs that were best suited to them. Leary himself had designed a few of them and used that knowledge to get a gardening assignment. He escaped shortly after.
xV8y7 Til that Superman didn't get the ability to fly till the 1940's. Before his first animated film in 1941, he could jump really high (1/8th of a mile, to be specific) but then had to land back on earth. His power to jump over buildings was actually supposed to be taken literally.
R74x6 TIL that Parks & Recreation successfully predicted the Chicago Cubs to win the 2016 World Series in one of their episodes that aired in 2015.