ooouroboros t1_ishb0yk wrote
Reply to comment by bubliksmaz in 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. by vect77
Its possible early people regarded jealousy as related to sexual access rather then to passing on one's 'blood'.
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