How to be a bat

Close your eyes and hold your hand in front of your face. Say “shhhh” while moving your hand up and down, forward and back, right and left. Better, get a friend to move her hand around while you do this. You can hear where the hand is, no? Close your eyes and walk toward a wall, saying “hi, hi, hi, hi…”. Can’t you hear how far the wall is? With a couple of practice trials, most people find it fairly easy to stop within a few inches of the wall without touching it.Echolocation is cool. Link