(International Herald Tribune) -- Our brains were shaped and sharpened by movement, an emerging view of human evolution goes, and we continue to require regular physical activity in order for our brains to function optimally.

WASHINGTON (AP) -- Accusing the NFL players' union of "trying to back out" of an August 2011 agreement to start checking for human growth hormone, a congressman worried aloud Wednesday that the league will head into next season without a test for the banned drug.

WASHINGTON (AP) -- Nicole Ari Parker was motivated by frustration. For Star Jones, it was a matter of life or death. Toni Carey wanted a fresh start after a bad breakup.

WASHINGTON (Deutsche Presse-Agentur (dpa)) -- A new study suggests that mild but repeated brain injuries often sustained by athletes can lead to degenerative brain disease in the long run.