David A. Leopold is in the Section on Cognitive Neurophysiology and Imaging, National Institute of Mental Health, Bethseda, Maryland 20814, USA. In the 1930s, the neurosurgeon Wilder Penfield ...

Hormones coordinate different body functions by carrying messages through the bloodstream to target cells and tissues. Hormonal imbalances occur through inadequate or excess hormone synthesis, which ...

Human evolution is often told as a tidy story of adaptation, yet some of our most familiar body parts still defy straightforward explanation. From the jut of the human chin to the curve of the outer ...

Researchers find obelisks, mysterious RNA molecules in human bacteria that challenge our understanding of viruses and ...

Many body parts can be transplanted or replaced with artificial equivalents, including corneas, livers, hearts, joints, and even entire faces. This technology will improve by leaps and bounds ...