The CDC rarely gets requests to investigate cancer clusters, and it is rarer still that the agency finds a cancer cluster exists, much less what caused it.

Many kids and adults aren't getting enough Vitamin D. The solution may be as simple as spending more time in the sun.

A dramatic rise of birth defects in India's Punjab breadbasket seems to be caused by uranium pollution, which in turn seems to be caused by ash from coal-burning electric power plants.

"Parasitic infections and other diseases usually associated with the developing world are cropping up with alarming frequency among U.S. poor, especially in states along the U.S.-Mexico border, the rural South and in Appalachia, according to researchers."

The tobacco industry sees its future in recruitment of new smokers, some very young, in the Third World.