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image: Seasonality of Premature Birth

Seasonality of Premature Birth

By | July 9, 2013

Babies conceived in May have an elevated risk of being born early.

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In Chapter 3, “From Mating to Conception,” author Robert Martin explores the question of why humans and other primates frequently engage in sexual intercourse when females are not fertile.


image: Widening the Fertile Window

Widening the Fertile Window

By | July 1, 2013

Women may be able to store viable sperm for longer than a week, thus contributing to apparent variability in pregnancy lengths.

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