Jazz2K on 26 February 2012
I've seen a documentary on some kid that lost his eyesight and had his eyes removed for them not to rot. The thing is that after a while he developped the ability to see with echo location. It was accurate enough that he could see incoming cars, and sidewalk elevations. He had to make some noise with his mouth and when the noise bounced off something he could see the shape of what it was... I believe the documentary said there were a few people around the world with such abilities and it was accessible to all humans. Years of practice or nature trying to adapt to different situations...
