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TIL that in pitch darkness, the human eye can detect a single photon

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oB0yR TIL that almost all mammals except for primates are red-green colourblind. This is because all living mammals descend from a small shrew-like species that lived in burrows and mostly came out at night, which had partially lost its sense of vision due to its dark habitat
KYrWE TIL For the Movie Angels with Dirty Faces (1938), James Cagney's main inspiration for playing the role of Rocky was a drug-addicted pimp, who stood on a street corner all day hitching his trousers, twitching his neck, and repeating: "Whadda ya hear! Whadda ya say!"
pYv6Q TIL that the crew of the USS Triton were not told what the goal of Operation Sandblast was (a submerged circumnavigation of the world) until the submarine had already left port and was underway
VMYA4 TIL that due to the limited number of different names on Norfolk Island, the island’s telephone directory lists people with common names by their nickname. There are entries for Cane Toad, Lettuce Leaf, Goof, Diddles, Rubber Duck, Carrots and Tarzan.
gNY7 TIL the former Prime Minister of Vietnam moved to Orange County after the war, where he opened and ran a liquor store