ovulation

Rounds of trial-and-error exploring the layer of cells covering the ovary leave open questions about stem cells that are associated with ovarian cancer.

The phenomenon may have arisen to trigger hormonal surges and drive ovulation, scientists propose.

Researchers develop a method for estimating the body temperatures of long-extinct species, and suggest that dinosaurs operated somewhere between endothermy and exothermy.

A round-up of recent discoveries in behavior research

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

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.