Drew Petersen’s body bounced from rock to rock as he fell down a steep, rugged slope while skiing in Colorado’s High Country.

Concussions are a common type of mild and temporary brain injury, but signs can last for weeks. A doctor has warned of a ...

Some analysis suggests an IQ increase of about 15 points in the general population, as reflected in standard military aptitude tests in parts of the U.S. that were most profoundly iodine-deficient, ...