Ben Underwood died at the start of this year (January, 2009). He is noted for having taught himself how to see with his ears after cancer took both of his eyes. He learned how to not only pick up on pressure and sound variances, but then taught himself how to click with his tongue and pick up on the echoes it created (echolocation). It really is better simply to watch than explain:
[note: five-part video, automatically switches]
The Transhumanist movement (h+) as well as the blind have a lot to learn from the life he lived and discoveries he made. For more on echolocation, here is the entry on Wikipedia:
http://en.wikipedia.org/wiki/Ben_Underwood
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