Scientists worry that not enough testing has been done yet to understand the effects on the environment -- how will tiny particles affect plants and animals that we eat, for example? | Matthias Kulka/Corbis

Nanoparticle Safety Still Unknown

Experts say the rise of nanomaterials is a concern because compounds at the nano-scale often behave much differently than at normal size.

Published On 08/30/2012
8:00 AM EDT