Did the defeat of smallpox open the door to HIV/AIDS? George Mason University scientist Raymond Weinstein reports that smallpox vaccine reduces HIV replication by a factor of five. It may not be a coincidence, he speculates, that as smallpox vaccination programs ended during the 1960s and 1970s, thanks to the eradiation of the virus, HIV began its deadly spread around the world.

Anger and stress have long been known to endanger the heart. New research from the Nurses Health Study suggests that chronic depression–and antidepressants–may be equally damaging.