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TIL that there is a rare condition called tetrachromacy, which allows some people, mostly women, to see 100 million different colors, due to having four color receptors. This is far more than the 1 million shades normal people can see with their 3 color receptors.

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4koEg TIL that in 1986, a French woman invested several months of her time to gain the necessary qualifications to operate a helicopter. She then proceeded to rent one, fly it over a prison, and successfully extract her husband, a convicted bank robber, from the prison's roof.
NXY1 TIL that in the mid-1800s France gave out a crucial patent in photography for free as a gift to the world … except for Britain. They had to pay.
dDl8K TIL that the long running radio program about a Black maid named Beulah was originally voiced by a white man. The character was in several radio programs before finally landing her own series, which later transitioned to television.
rNN14 TIL Harald Hirschsprung (describer of Hirschsprung's disease) helped establish a children's hospital named after Queen Louisa of Denmark in 1879. She wanted the walls decorated with Bible verses, but Hirschsprung insisted on pictures of animals. After this, the Queen declined to enter the hospital
x6XQb TIL approximately 73% of the mass of the visible universe is in the form of hydrogen. Helium makes up about 25% of the mass, and everything else represents only 2%. Most of the atoms in our bodies and Earth are a part of this small portion of the matter of the universe