Human Sonar Devices - Can We Build Them?

[Information and Education: Future concepts] Many species of the planet to use sonar to guide and sound in the dark or the location of objects around them ocean. Bats and dolphins, as the use of sound waves in this way. Not long ago, a wise man said: "Why, we created a device that was very small and attaches to the ear or implanted person to act as a sonar man."