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Carbon Nanotubes: Good guys? Bad guys?

Introducing carbon nanotubes, a scientific wonder substance. You may not have heard of carbon nanotubes (or CNTs), but they are probably already part of your life. They may be in your cell phone or computer, where they are used as semiconductors, or part of your bike frame, where they provide strength without weight. They could even be in your tires, helping improve handling on slick roadways.