Researchers have discovered that male rats infected with the parasite Toxoplasma respond strongly to the odor of cat urine.

Is aggression always the best response to a challenge? Testosterone may not necessarily cause aggression but behavior can drive testosterone secretion.

By RITA CARTER THE GECKOS FOOT: Bio-Inspiration Engineering New Materials From Nature by Peter Forbes (4th Estate, Pounds 20) MONKEYLUV by Robert M. Sapolsky (Jonathan Cape, Pounds 17.99) WE ALL know it is a scientific fact that bumble bees can't fly (or rather, glide).

The immune cells of women under extreme mental stress age faster than those in women not facing such pressure, a new study reports. While previous reports have linked physical effects with stress, the new analysis helps pinpoint an important focus for these problems.