Speculation on population numbers raise questions about whether the planet can sustain us all.
Online grieving isn't new, but researchers are now figuring out whether it does any good.
If he had spent more time in the sun, it might have forestalled Mozart's untimely death at 35.
Sure, the FDA's new cigarette warning labels are shocking, but can they help people quit?
Sharply reducing emissions of soot and smog could play a critical role in preventing Earth from overheating.
A new kind of artificial heart uses whirling motors to 'spin' blood -- rather than pump it -- through the body.
Nicknamed "Doctor Death," Kevorkian claims he actively helped 130 people to die.
Nearly 30 million people have been killed by AIDS and more than 33 million have the virus that causes it.
A Facebook craze could be putting some people in harm's way.
Most ants in the grip of a deadly fungus spend their last moments on Earth around midday.