Boom Supersonic test pilot uses precise maneuvering to help NASA snap a photo of the firm’s civil supersonic jet in flight.

It then partially closes its mouth and emits a call that ranges from a frequency band audible to humans to an inaudible ultrasound band. “In light of the fact that amphibian diversity in Brazil ...

Up to 18% of Americans say they've seen a ghost, and there might be scientific explanation for it. A specific tone, called the 'ghost frequency' could create a vibration that shakes the eyes and ...

A new study now shows for the first time how amphibians defend themselves by screaming that is inaudible to human ears. Researchers have for the first time recorded the use of ultrasound by ...