Everyone ____ challenges in their lives, but some are more significant than others. Daniel Kish ____ his eyes when he was fourteen months old. Soon after, however, he started to ____ clicking sounds with his ____ to help him move around. He now moves about using sonar. He is so ____ at it he can ride a bicycle in traffic. In this interview, Kish ____ how the process works. How does human sonar work? "When I make a click sound, it makes sound waves that ____ off surfaces all around and ____ to my ears. My brain then processes the sounds into images. What is it like riding a bike using sonar? "It's thrilling but requires a lot of ____. I click up to two times per second." Is it ____ to move around world in this way? "Much of the world lives in fear of things that we mostly ____. I climb anything and everything, but I never ____ a bone as a kid." How ____ is it to teach people to use sonar? "Many students are ____ how quickly results ____. Seeing isn't in the eyes; it's in the mind."

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