Swiming along
Epididimus with sperm

The toughest race on earth starts here. Only the fittest will have a chance, and only a very few lucky ones will win. Yet the prize is worth fighting for: to pass on their genes to the next generation. In the contorted tubes inside the testicles we find the factory of champions (and losers too). The runners are mass-produced, secreted, and matured until ready to be released. Good luck, and may the best sperm win.

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