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190

TIL that our blood is red because it is rich in iron. Some animals have blue blood because it is rich in copper.

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1aM4d TIL that there are only 6 African-American billionaires, with a third of them being hip-hop artists (Jay-Z and Kanye West)
PYB4J TIL in 1924, the US had "Radio Silence Day" where radio broadcasts would be kept quiet for 5 minutes every hour in order to listen for radio signals from space. They didn't hear anything.
d8YWj TIL During the American Revolution, a Virginian Officer named Charles Lynch became so famous for hanging Loyalist they called it Lynches Law. Thus, the act of hanging a Tory became known as lynching.
eAk4 TIL that big banks can borrow money from the government at a much lower interest rate than college students
gMwKy TIL In 36 BCE, Roman statesman Marcus Varro wrote about germs, describing “minute creatures which cannot be seen by the eyes, which…enter the body through the mouth and nose and there cause serious diseases.” The germ theory of disease would not be accepted widely for another 1,900 years.