A tractor beam, reminiscent of the one used in sci-fi classic Star Trek, has been developed that uses sound to capture and manoeuvre objects in mid-air.
The technology focuses waves of high intensity sound to grab, lift and move small items in a similar way to a human hand, and as precisely as a pair of tweezers.
While it is a long way from being powerful enough to ensnare the kinds of objects seen in the TV series, it could help revolutionise delicate procedures like assembling electronic components, transporting drugs or conducting surgery.
