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TIL that the Air Ministry imposed a blackout of all man made lights across London because they forecasted they would be targeted for night time air raids. This was before war was declared.

X0AN8 TIL the population of vultures in South Asia has decreased by 99.95% since the 1990s. Researchers discovered the culprit to be an anti-inflammatory drug, Diclofenac, which was being commonly administered to livestock. This represents the sharpest rate of decline of any animal known to man.
6E6lw TIL In 1897 a Swedish Balloonist and his two colleagues began their nationally covered journey to fly over the North Pole in a hydrogen balloon. Four decades later a whaling ship came across their remains on a small arctic island, having crashed and perished in the tough arctic climate.
kOGmm TIL before Cliven Bundy went to prison for his armed standoff against the government, he was partially responsible for keeping alive a strain of ancient crookneck watermelon who's seeds were found hidden in a cave in Arizona in the 1920s.
wLwaM TIL that hippo sweat has a reddish-orange coloration that acts as a natural sunblock. The sticky substance also helps regulate the hippo’s body temperature and discourages bacterial infection.
e0rW6 TIL Germany’s censorship laws in video games are so strict that they are not allowed to show violence or death of any kind. To get around this, enemies in video games are changed from humans to robots, so that when they are shot, there is technically no blood or death shown on screen