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TIL we tend to dislike the sound of our voice when we hear it in recordings because vibrations in our skulls make our voices sound richer and deeper than they are in reality

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E8nV TIL: Humans and Giraffes have the same number of neck vertebrae. In fact all mammals do, with the exception of manatees and sloths!
AD4kx TIL that in 1869, physicist Ludvig Lorenz developed an equation for the relationship between the refractive index of a medium and it's density. In 1878, unrelated physicist Hendrick Lorentz independantly discovered the same equation. The result is called the Lorentz–Lorenz equation.
x66ND TIL I learned about Herschel "Woody" Williams. The last surviving WWII Medal of Honor recipient.
ADlYw TIL - The practice of giving money to children for their baby teeth likely started with the Vikings. Children's teeth were believed to bring good luck in battle, and Vikings would create necklaces from them.
WklnL TIL Zoos use birth control on their animals in captivity to regulate breeding.