Earlier it was the "transporter" working on atomic particles, now it's a tractor beam using sound waves!

Real-life tractor beam levitates objects using sound waves - CBS News

By tightly orchestrating the release of these sound waves, it should be possible to create a region with low pressure that effectively counteracts gravity, trapping an object in midair. If the object tries to move left, right, up or down, higher-pressure zones around the object nudge it back into its low-pressure, quiet zone.

Not so wonderful with open containers of liquids