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How much do you know about sperm cells? You know guys make a lot of them--but how many? You know they're small--but how small?
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All rights reserved. Popular photos have surfaced online showing sperm whales gathered together, seemingly motionless and arranged vertically in the water. The whales, which are roughly the size of school buses, almost always appear to be "standing" and clustered in pods of five or six.
A recent study that tested both men and dogs added to concerns that chemicals in the environment are damaging the quality and quantity of sperm. Make a contribution. Fri 24 May
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