Concerns in a Nano World

Video streaming by http://www.AllthingsScience.com At 10,000 times smaller than the width of a human hair, you can't see nanoparticles, but you can find them in everyday products like sunscreen and clothing. But environmental and health concerns are mounting about exposure to nanomaterials, sparking a growing debate about their possible regulation. QUEST looks further into nanotechnology, as this rapidly expanding field begins to play a larger part in our lives.