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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
Tech

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.

August 30, 2012
3:00 AM EDT