You are blind so you climb Mount Everest with your tongue..

Eric Weihenmayer, is the only blind person to have climbed Mount Everest. And he scaled the highly dangerous and extreme rock faces with his tongue as his eyes.

But how was this done? Although the tongue is normally a taste organ its moisture and chemical environment makes it an excellent 'brain machine' when a tingling electrode grid is placed on its surface. The grid when afixed to the tongue then translates a video input into patterns of electrical impulses. The blind mountaineer can then climb with a grid of over 600 tiny electrodes attached to his mouth called the 'Brain port'.

This is an amazing illustration of the brain's plasticity.