A study published last month by University of Minnesota mechanical engineering researchers has the potential to make waves – ultrasonic waves, to be exact – in fields like surgery and manufacturing. U ...

Tractor beams have hit the big time. A newly constructed device generates a beam of concentrated sound that, for the first time, exerts a continuous, perceptible tug on objects large enough to see.

Powerful, carefully controlled sound waves could be used to control objects without having to touch them at all–even inside the human body. This video shows a real live tractor beam in action. It uses ...