Yeah, I heard about it in a book called Sperm Wars. Only a small number of sperm actually go for the goal, while the rest, especially those strange looking sperm with more than one head and/or tail, are there for the sole perpose of fighting off another men's sperm!
Sperm competition - Wikipedia, the free encyclopedia
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"I don't know that I ever wanted greatness, on its own. It seems rather like wanting to be an engineer, rather than wanting to design something - or wanting to be a writer, rather than wanting to write. It should be a by-product, not a thing in itself. Otherwise, it's just an ego trip."
Roger Zelazny
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