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TIL: Sperms were thought to move by wiggling their tails side-to-side, like eels, for 350 years. But research shows that they roll as they move forward like a spinning top.

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XEa5r TIL there are 14,033 animals on the “least concern” list of endangerment and some of those animals numbers, like the Galah (species of parrot) are steadily increasing.
ANNog TIL of a type of ant called a "gamergate". It is a worker ant that can lay eggs and reproduce (unlike typical worker ants which are sterile), and some species of ants have completely replaced queens with gamergates.
7rQbP TIL that after the Crusaders captured Jerusalem, they massacred the Jew and Muslim population, including women and children. The massacre was so large, that the Crusaders were supposedly wading in blood up to their ankles.
PJDL TIL George Reeves, the actor who played Superman in the 1950s was wary because some fans tried to test his “invulnerability.” At one appearance a young fan pulled a pistol on him. Reeves convinced him to hand over the gun by telling him that a bystander could be hurt when the bullets bounced off
e0ZZ4 TIL One of Whoopi Goldberg’s first jobs was as a mortuary beautician.