More than 600 types cohabit with people in their living space

9 out of 10 exceed daily recommendations, CDC researchers find

Rather, adolescents' nocturnal tendencies a mismatch for early school start times, sleep specialist says

Athletes and non-athletes alike may overdo it, sometimes with tragic consequences

Focus your attention on something else

Simple steps may help

Medical conditions, mental illness and substance abuse problems often overlap, researchers say

Three-shot regimen seems to control lesions as effectively as daily pills, but wider trials needed

Water's temperature appears to be more important than how much you drink, researchers find

Inhaling black carbon from traffic offsets benefits, environmental health specialist says