More and more evidence shows evolution isn't as random as often thought.
The genes in our cells' mitochondria are passed on in a different way than the vast majority of our DNA. New studies shed light on how the unique process isn't derailed by mutations.
An ancient sexual conflict over mitochondrial inheritance may be responsible for the evolution of the two sexes as we know them.
Anti-ageing research often uses short-lived model species such as mice. But these species age in a very different way to us, so they may not tell us all that much about boosting our own lifespans.
Women often say their periods begin at the same time as their friends'.
Going naked in public has its own benefits.
Scientists of all kinds turn to computer models to investigate questions they can't get at any other way. Here's how models work and why we can trust them.
From dancing to giving presents, animals have evolved some effective and surprisingly familiar ways of wooing a mate.