Fighting Alzheimer's disease with pulsing light

Researchers at Georgia Tech want to develop a weapon to fight Alzheimer's disease by pulsing light. They have found light that flickers at 40 hertz or 40 beats per second may stimulate brain function.

Man survives cardiac arrest due to quick CPR response

A Roswell man survived an incredibly close call last fall, when his heart suddenly faltered and stopped. But 58-year-old Brad Ramsey not only lived through cardiac arrest, but he has also fully recovered. And Ramsey says he owes his life to strangers who reacted quickly and knew how to do CPR.

Man survives cardiac arrest due to quick CPR response

A Roswell man survived an incredibly close call last fall, when his heart suddenly faltered and stopped. But 58-year-old Brad Ramsey not only lived through cardiac arrest, but he has also fully recovered. And Ramsey says he owes his life to strangers who reacted quickly and knew how to do CPR.

New report ranks the most polluted places in the U.S.

The American Lung Association says 131.2 million people – that’s 39% of Americans – live in communities with failing grades for levels of pollution. Here's a map of the best and worst.