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TIL that in 1996, a three year old boy fell into the gorilla exhibit at the Brookfield Zoo. The child was rescued by a mother gorilla who cradled him until the zookeepers arrived.

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lopZA TIL about Project Pigeon where psychologist B.F. Skinner developed pigeon-guided missiles for World War II. He put pigeons in the nose cones of missiles and trained them to peck at targets. It was effective but never got off the ground because nobody took them seriously and radar became popular.
ynLe TIL That GPS is wholly controlled by the USA and can be ‘switched off’ at any time.
8O4a TIL of black rain, a form of precipitation caused by the immediate aftermath of a nuclear detonation, in which the water is black and sticky due to radioactive materials in the air.
4oMJ TIL Google has found GPA’s and test scores to be “worthless as a criteria for hiring”; they have teams where 14% of their employees haven’t gone to college
6EoxJ TIL Martin Luther's son, Paul, was a survivor of the bubonic plague. After surviving, he dedicated his life to chemistry and medicine, developing the pharmaceuticals Unguentum ex nitro, Magistrum perlarum, Magistrum collorum, and Aurum potabile.