Add a new way of perceiving things. Learn to echolocate! “Two hours per day for a couple of weeks are enough to distinguish whether you have an object in front of you. Within another couple weeks you can tell the difference between trees and pavement.” Click here. []

This guy actually did it! Ben Underwood.

Sadly, Ben Underwood has succumbed to cancer.
News feed here.
But, more on human echolocation here.