A Moment of Science

Posts tagged sperm cells

February 10, 2006

 

boy_girl

Why Are There Males and Females?

Why are there males and females? Why are there two sexes instead of three, or twelve, or one?

September 27, 2003

 

The Male Biological Clock

There’s a common belief that men can sire children until they die, but that women need to be relatively young to conceive healthy children. But the father’s age affects the child’s health too.

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