StevenCarlson.org

With just a few weeks of training, you can learn to “see” objects in the dark using echolocation the same way dolphins and bats do. Ordinary people with no special skills can use tongue clicks to visualize objects by listening to the way sound echoes off their surroundings, according to acoustic experts at the University of Alcalá de Henares in Spain. “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.” (via Make Like a Dolphin: Learn Echolocation | Wired Science | Wired.com)