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TIL African Americans have high rates of European, Native American and Chinese ancestry. For example, scientific analysis indicates that African Americans inherit about 14–17.7% of their ancestry from Europeans.

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KOvAB TIL the "Spider-Man Lizard" or the Mwanza flat-headed rock agama is found in Tanzania, Rwanda, and Kenya. Only the male is so brightly colored: head, neck, and shoulders are bright red, while the body is dark shiny blue. Males preferably have around five breeding partners and are highly territorial.
DJWV TIL Every year the British Medical Journal publishes an issue full of joke science, like one paper that said men die before women because they are stupid. But years later these articles are cited by scientists as real, and this is causing a lot of problems.
D1bGP TIL that the youngest person to serve in World War II was 12 years old and also received a Purple Heart.
loVlB TIL: In Taiwan, today, August 8th is celebrated as Father's Day because in Mandarin, 08/08 has the same pronunciation as the word for father: "Ba Ba"
E1LjP TIL that Ancient Roman concrete was stronger than modern.