Bats do it, dolphins do it. Now humans can do it, too. - Berkeley NewsBats do it, dolphins do it. Now humans can do it, too. UC Berkeley physicists have used graphene to build lightweight ultrasonic loudspeakers and microphones, enabling people to mimic bats or dolphins’ ability to use sound to communicate and gauge the distance and speed of objects around them. By Robert Sanders UC Berkeley physicists have used graphene to build lightweight ultrasonic loudspeakers
