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TIL Dogs can roll their eyes when annoyed, similarly to humans!

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1a4gO TIL of Valerie Browning - a woman who with her husband Ishmael has been serving the people of Afar, Ethiopia (one of the hottest places on earth) since 1973. She grew up in Armidale, New South Wales. She has been providing medicine, food and education to the people living there.
8aM6a TIL that shark skin is made up of hundreds of rows of small teeth. When flattened through forward movement, they create tiny vortices that reduce drag, turbulence and noise.
16Jw8 TIL the historical meridian marker in Greenwich is actually off by about 100 metres because the unevenness in the mass of the Earth bends the light of the stars that were used to calculate it
Zv TIL that a girl successfully created three male alter-egos in order to date two of her friends.
GnLG TIL Abraham Lincoln supported colonizing blacks in South America, or sending them back to Africa.