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TIL that the earliest refutation of UFOs was written in the 9th century by Agobard of Lyon, who wrote against the claims of peasants that ‘sky sailors’ were coming to steal their crops in his treatise ‘On Hail and Thunder’

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via reddit.com

Eg0dW TIL Africa accounts for just 3% of the world's trade
yVMEv TIL the former Valencia street circuit, which once hosted Formula 1 racing between 2008 and 2012, cost $300 million to build and is now a shanty town occupied by migrants.
690Jl TIL about Frise ailerons - ailerons that don't pivot at the edge but rather somewhere in the middle. This means that the aileron dips below the wing creating addition drag. This is considered desirable as it helps counter the induced yaw produced by the opposite aileron, making flight easier
QJme6 TIL that a KGB agent and a CIA agent became friends while trying to recruit each other; they knew the other was a spy and just didn’t talk about it
E1D9w TIL that, although park authorities deny it, Central Park officially has a population of 25 residents according to the 2010 census