The same properties of nanoparticles makes it so attractive to producers could have negative effects on the environment and human health. However, little is known, the particles can be harmful. Part of the problem is to determine what nanoparticles.

How much radiation does your cell phone emit? It's easy to find out the answer thanks to the Environmental Working Group's new online guide to cell phone emissions.

The non-profit research and advocacy group ranked over 1,000 different cell phones according to radiation levels. It looked at the publicly available, but difficult to find, specific absorption rate (SAR) for each phone. SAR is a measure of how much radiation is absorbed by the body when the phone is sending a signal to the network. (Your phone only emits radiation when you talk or text.)

Floating perfectly quietly on the surface of Kealakekua Bay, off the Big Island of Hawaii, I can hear fish chewing on coral. It sounds like sandpaper against rock, with the occasional burp. Keala­kekua ("pathway to God" in old Hawaiian) is one of the most beautiful places on earth—and the place I've come to begin my undersea investigation of an ecological disaster in the making: the disappearance of the world's coral.