But marijuana advocate calls the study 'speculative'
U.S. summit draws attention to a technology with great potential -- and peril
Study finds 'Back to Sleep' messages worked, but so did lower smoking and teen pregnancy rates
Study found higher levels of beta amyloid in brains of those who didn't move as fast as their peers
Study finds better prognosis in women whose tumors have spread beyond the breast, nearby lymph nodes
Low levels of physical activity also tied to decreased mental function later in life, study finds
Many don't meet targets, and expert says even those targets aren't good enough to prevent heart attacks
Bright flash shows up as gas bubble forms in joints, researchers report
Waiting 45 seconds was linked to enhanced motor skills among infants in study
Surveys show a nearly 10 percent increase across a range of specialties in the U.S.