Driving a Wheel Chair With Your Tongue

This is a really cool example of  using technology to come up with a unique solution to a problem:

The newest prototype of the Tongue Drive System which enables quadriplegics the ability to operate wheelchairs and other devices by moving their tongues,  makes use of a dental retainer with sensors to help control the system.The embedded sensors within the retainer track the movements of a small magnet attached to the tongue.