ultrasound – Michael Allen

We’ve mastered acoustic levitation – and it is surprisingly useful

Making images with sound

Ultrasound device creates an audio, visual and tactile 3D display

Ultrasound guides particle in a midair display

Watch a ‘sonic tractor beam’ do some midair sewing

Acoustic tractor beam can grab objects from behind obstacles

Watch this bat-inspired robot navigate like a real one

Focused ultrasound opens the blood–brain barrier

Ultrasound can trigger and enhance cancer drug delivery

Watch the world’s most powerful tractor beam levitate its biggest catch