“Use acoustic waves to hold in mid-air samples such as water, ants or tiny electric components. This technology has been previously restricted to a couple of research labs but now you can make it at your home.
If you want more background and details you can check our Open Access papers:
More details and supplementary information about this levitatorHow Acoustic Tractor Beams WorkAcoustic Delay Lines for Compact Tractor beamsDo not forget to watch the attached video. The first video is the instructions whereas the second one is a fantastic video by Physics Girl explaining the physics behind it.”