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TIL a very small proportion of people have two copies of a mutant form of the CCR5 gene, which makes them greatly resistant to acquiring HIV / AIDS.

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4X8yb TIL that the percent of of a NCAA college athletes “going pro” (becoming a professional level player) is less than 2% for all sports, except men’s ice hockey (5.6%) and baseball (9.1%)
o5DW TIL Texas uses elementary kids reading test scores to determine how many prisons and hospitals will be built in 10 years.
DQdkV TIL Muhammad Ali’s speaking rate slowed 16 percent after his 1977 15-round fight against Ernie Shavers
VB4LZ TIL: An old english medicine receipt book from the 10th century contains a receipt for eyesalve consisting of vine, garlic, leeks and bile from a cow's stomach. Then it has to sit for 9 days in a brass bowl. Test from 2015 showed it to have a similar effect as modern antibiotics.
4E7a TIL the day before volcanologists Maurice and Katia Krafft died in a pyroclastic flow, Maurice’s last words were “I am never afraid because I have seen so much eruptions in 23 years that even if I die tomorrow, I don’t care”