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TIL Shrapnel is named after its inventor; Henry Shrapnel

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6E0AX TIL of Hertha Oberheuser a Nazi physician described as a "devil" by survivors, who was sentenced to 20 years in prison but got out on good behavior after only 5 years and later worked as a pediatrician in Germany until her licensed was revoked due to pressure from the Press
wMrE TIL Sweden was the first to find out about the censored Chernobyl accident when one of the workers at the Forsmark power plant set off evacuation alarms when he had walked through grass that had been contaminated from radioactive rain picked up from Chernobyl over 800 miles away.
nWld7 TIL that in 2001, actor Mark Ruffalo had a realistic dream that he had a brain tumor. Despite no previous signs, he went to see a doctor due to the vividness of his dream. The doctor ordered a scan and it turned out that he did indeed have a tumor, which was subsequently removed.
J19Kv TIL that birds rub ants on themselves. This behavior is known as 'anting' and is thought to serve self-maintenance functions
BrKvD TIL that B Cells are called B cells because they mature in the Bone Marrow whilst T cells mature in the Thymus