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Chemically Freezing Sperm Tails Could Be the Key to a Reversible Male Contraceptive

As sperm swim they transform chemical energy into motion, the way a car’s engine uses gas to propel you down the road. Like that engine, the process is complicated—if just one part stops working, the whole system can grind to a halt. This idea might lead to a contraceptive for men that’s reversible.

The First Person Who Ever Saw Sperm Cells Collected Them From His Wife

It’s a bright day in 1677, in the city of Delft, and Antonie van Leeuwenhoek is making love to his wife. But moments after he shudders with orgasm, he hurries out of bed to grab his microscope. After all, he’s not just spending time with his wife: he’s running an important scientific experiment at the request of the…