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TIL if a males results are positive from a pregnancy test it may indicate testicular cancer

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MB00 TIL of “Unsinkable” Sam, a sailor during WWII who survived the sinking of the Bismarck, switched sides to the Allies, then survived the sinking of both the HMS Cossack and the HMS Ark Royal. Unsinkable Sam is also a cat.
KnBJ TIL that humans came very close to extinction at least 3 times, at one point possibly falling to a worldwide population of 600
16ybO TIL that Acacia trees developped a defense response to giraffe browsing by increasing their thorn length, tannin production within leaves and airborne tannin release. This triggered a change in the giraffe's behaviour which adapted to move upwind and eat fewer leaves per trees.
MearV TIL jet engines are tested against bird strikes using a "Chicken Gun" that fires dead chicken bodies at them.
rNy6o TIL the 1971 film "Wake In Fright" follows a man stranded in an isolated outback town whose residents are consumed by binge drinking and gambling. During the film's early screening in Sydney, an offended viewer shouted, "That's not us!" One of the actors yelled back "Sit down, mate. It is us."