<http://schema.org/description>
"It is common knowledge that bats and dolphins echolocate, emitting bursts of sounds and then listening to the echoes that bounce back to detect objects. What is less well-known is that people can echolocate too. In fact, there are blind people who have learned to make clicks with their mouths and to use the returning echoes from those clicks to sense their surroundings. Some of these individuals are so adept at echolocation that they can use this skill to navigate unknown environments, and participate in activities such as mountain biking and basketball."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2011-05-i-can-hear-a-building.html>