Technique allows them to ride bikes and skateboards fearlessly.
Daniel Kish was born with retinal cancer and lost both eyes soon after his first birthday. He unconsciously began making clicking noises with his tongue to navigate, as other blind children often do.
But unlike many other parents of blind children, the Los Angeles Times reports, his mother and father let him roam their neighborhood in Placentia like any other 1970s kid.
Now 49, Kish runs World Access for the Blind here, teaching his blind students to send out sonar, like dolphins or bats — a human form of echolocation.
Read the full story: