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Make Like a Dolphin: Learn Echolocation | Wired Science | Wired.com
www.wired.com/wiredscience/2009/06/echolocation/, posted 2009 by peter in audio health science
“Two hours per day for a couple of weeks are enough to distinguish whether you have an object in front of you,” Juan Antonio Martinez said in a press release. “Within another couple weeks you can tell the difference between trees and pavement.”