When we talk about a biological clock ticking, it usually means the pressure women feel to fall pregnant before a certain age. It’s linked to the decline in eggs (ova) and fertility as females age.

Wildlife conservation is a race against time — too often, a losing one. Typically, by the time scientists detect signs of species decline, populations have already collapsed. Genetic diversity is ...

The expression “my biological clock is ticking” is often associated with women. But new research underscores just how much it applies to men. This study comes out of the Colorado Center for ...