Acoustic waves play many everyday roles -- from communication between people to ultrasound imaging. Now the highest frequency acoustic waves in materials, with nearly atomic-scale wavelengths, promise ...

Levitation is no longer just the realm of magicians, with engineers dabbling in ways to suspend objects in midair using magnets, heat flow or sound waves. Unfortunately, it usually only works with ...

Moth wing scales, which are used for camouflage against bats, act as ultrasound-absorbing metamaterials, according to a study. Bats track prey using ultrasound-mediated echolocation, and moth species ...