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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.

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Capsule Reviews

By | July 1, 2013

Denial, Probably Approximately Correct, Permanent Present Tense, and Against Their Will

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Speaking of Science

By | July 1, 2013

July 2013's selection of notable quotes

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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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image: The Art of Science

The Art of Science

By | June 21, 2013

Princeton scientists and engineers create a stunning collection of scientific images better suited for a gallery than a lab meeting.

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image: Week in Review, June 17–21

Week in Review, June 17–21

By | June 21, 2013

On the gene patent decision; a high-res human brain model; bats’ influence on moths mating calls; toxicants threaten brain health; platelet-driven immunity

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image: Nailing Regeneration

Nailing Regeneration

By | June 12, 2013

Researchers identify the signaling program that enables finger and toenail stem cells to direct digit regeneration after amputation.

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Opinion: Going International

By and | June 10, 2013

US universities need to reach across their own borders to retain global scientific preeminence.

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image: Opinion: The Dilemma of Diversity

Opinion: The Dilemma of Diversity

By | June 10, 2013

The NIH remains a Caucasian-dominated workforce. Why haven’t the agency’s efforts to diversify been successful?

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image: Why Many Birds Don’t Have Penises

Why Many Birds Don’t Have Penises

By | June 7, 2013

In avian species, a gene induces programmed cell death during development in the area where a phallus would otherwise grow.

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