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TIL that sharks smell in "stereo," that is, they can detect the tiny delays in the time it takes for a scent to reach one nostril compared to the other and use it to determine the direction from where the scent is coming. This helps them in tracking their prey.

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wLp9P TIL the story of Emmett Till, a 14 year old boy that was lynched and terribly disfigured in 1955 for saying "bye baby" to a white woman. The mother demanded an open casket funeral to show the world what they had done. This event is a cornerstone of the civil rights movement.
g8KD TIL that some dogs that fail seeing-eye school go to work as bomb-sniffers for the ATF
kO8Qg TIL Penicillin was discovered accidentally after scientist Alexander Fleming left a window open allowing mold to grow on a contaminated Petri dish.
W7wA8 TIL about Parícutin, a volcano in Mexico that suddenly burst out of a farmer’s field in 1943, growing to a height of 200 metres in just 4 months.
V8bB TIL the African Clawed Frog provided the first well-documented method of detecting pregnancy in women. Injecting urine from a pregnant woman into a frog resulted in the frog laying eggs shortly after.