Here's what medical and public health experts are saying about the debate around fluoridation of drinking water.

After finding uranium and lead in my water, I spoke to experts to find out everything I needed to know about how to properly ...

A hand-held flashlight reveals the green color of a rough emerald from the Coscuez Emerald mine in Colombia. Photo by Eric Welch/GIA. Emerald is the green to bluish green variety of beryl, a mineral ...