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TIL that sperms don't swim. We have been wrong for the last 350 years. Using 3D microscopy technology were able to mathematically reconstruct the rapid movement of the sperm. The sperm body spins at the same time that the tail rotates around the swimming direction. Sperm drills into the fluid.

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yQdPv TIL of August Willich, a communist Union Army general who once challenged Karl Marx to a duel because he thought Marx was too conservative
OGG1 TIL the main culprit for toothlessness in rural Appalachia is “Mountain Dew Mouth” not inbreeding or poor dental hygiene as once suspected.
N7VgN TIL Prince is the sole credit on his first album. He sang all the parts and played all the instruments, including acoustic and electric guitars, acoustic piano and Fender Rhodes piano, synth bass, various keyboard synths by Oberheim, Moog and Arp, orchestra bells, drums, percussion and bass guitar.
xVxB TIL: There is a cave full of MASSIVE CRYSTALS 304 meters underneath Mexico. Seriously “Journey To The Centre Of The Earth” style.
gv7W TIL Alanis Morissette’s “Head Over Feet” is credited with the creation of the term “friends with benefits”