Why does making direct eye contact with someone give you that feeling of a special connection? Perhaps because it excites newly discovered "eye cells" in the amygdala, the part of the brain that processes emotions and social interactions.

Ursolic acid is a natural compound found in the waxy coats on apples and other fruits and herbs. Previous research showed that ursolic acid increased the activity of a protein that stimulated muscle growth and glucose metabolism in mice.

The hunt is intensifying for new treatments for migraines, the common and debilitating headaches that have confounded scientists for decades.

Test-tube babies have higher rates of birth defects, and doctors have long wondered: Is it because of certain fertility treatments or infertility itself? A large new study from Australia suggests both may play a role.