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By observing the inner workings of an octopus's leg or an elephant's trunk, scientists have created muscles from carbon nanotubes that could one day power machines.

For years artificial muscles have promised to deliver a more flexible, more durable alternative to electric motors and hydraulic systems.

What do earmuffs, television, and ChatRoulette have in common? They were all dreamed up by teenagers -- the same age group Google is targeting with its first-ever science fair, an online smarts search.