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Tired of having to wear a cell phone on your belt wherever you go? In the future, you may not have to. Two British researchers have developed a prototype "phone tooth" that can be embedded in a molar and receive cell-phone calls. The signals are translated into vibrations that travel from the tooth to your skull to your inner ear—where only you can hear them. Great for giving instructions to spies and NFL quarterbacks. Not so great for the rest of us, because while our teeth may talk to us, we canšt talk back to them.

Availability: Prototype
To Learn More: sciencemuseum.org.uk