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TIL of Flying Officer Lloyd Allan Trigg. A posthumous recipient of the Victoria Cross, his award is unique, as it was awarded on evidence solely provided by the enemy, for an action in which there were no surviving Allied witnesses to corroborate his gallantry.

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OokMX TIL dolphins and porpoises have a number of differences, and here are just two of them. Dolphins’ teeth are cone-shaped, while porpoises’ teeth are spade-shaped. Dolphins typically have a bulbous head and a clearly-defined "beak"; porpoises usually have a rounder face without the pronounced beak.
5VyWk TIL: ASL works just fine in microgravity.
j6PBj TIL that the first time the Albanian language was mentioned in History was a witness of a crime reporting he had heard someone yelling in Albanian.
gJG7 TIL that in 1967 the London Bridge, built in the 1830’s and spanned the River Thames, was taken apart and the bricks were numbered to be reconstructed in Lake Havasu, Arizona.
5YEp9 TIL UNESCO’s World Heritage Convention was created to preserve the Temple of Abu Simbel in Egypt. After the Nasser Dam was built, the temple was briefly submerged underwater and a large effort was undertaken to relocate the mountain it was carved on and rebuild the temple piece by piece.