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Matt: Why do humans produce so much sperm if only one will fertilize an egg? And why are they in competition with each other? It would seem simpler to have fewer with less competition. — ...
Susan Luzzaro 5:30 p.m., Dec. 7
Edward Magdaleno 4:49 p.m., Dec. 7
Ian Pike 2 p.m., Dec. 7
Mercy Baron 12:43 p.m., Dec. 7
Don Bauder 12:30 p.m., Dec. 7
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