We can hear sounds because our ears turn sound vibrations from the air, into signals that are sent to our brain. We can’t hear all levels of sounds. Sound waves with very high frequencies are ...

It is fascinating that the tiny bones in the middle ear appear to have evolved from gills that were no longer needed. Figure 2 shows the path that sound waves follow from the sound source where they ...

By combining ultrasound with a concept called nonlinear acoustics, you can create sound that stays silent until it reaches a ...