Body & Brain

Heart attacks worse in the morning, plus remembering dreams, lung stem cells and more in this week’s news

Surgical-center colonoscopies stack up
Colonoscopies performed at outpatient surgical centers are as safe as those done in hospitals, researchers at Emory University in Atlanta reported May 10 at the Digestive Disease Week meeting in Chicago. More than 174,000 Medicare records from 1992 to 2007 showed a 30-day complication rate of 3.4