Researchers have developed a device that reflects sound in the direction it came from, rather than deflecting it at an angle. The "retroreflector" can reflect sound across an operating range of 70 ...

Sept. 9 (UPI) --The uniquely shaped wingtips of some silk moths reflect sound waves, helping the insects avoid the jaws of hungry bats. Bats are nocturnal hunters, and though they can see pretty well ...