As if being locked in a series of metal tanks for 500 days isn't bad enough, six people will also be subjected to experiments in a simulated Mars mission

Scientists show that many insect groups like beetles and butterflies have fantastic numbers of species because these groups are so old. In contrast, less diverse groups, like mammals and birds, are evolutionarily younger. This is a surprisingly simple answer to a fundamental biological puzzle.

Exposure to levels of lead that are similar to those measured in lead-intoxicated children reduces the birth and survival of new neurons (neurogenesis) in the brain. A study of young adult rats provides evidence that explains exactly how exposure to lead during brain development produces learning deficits.

Filtering white cells from donor blood before a transfusion is much safer for patients and long overdue as a national standard for all surgical procedures, according to researchers.