A tiger's roar peaks at around 18 Hz, just below the threshold of human hearing, which begins at 20 Hz. That gap is not a flaw in the tiger's design. It is the design. Infrasound at 18 Hz does not ...

Humans perceive very low-frequency sounds through a unique electrical mechanism in the inner ear, rather than the mechanical process used for normal hearing. This discovery provides evidence ...

Wit Aniwat, whose family runs an elephant camp for tourists in Thailand, was awakened by an unusual alarm clock: the trumpeting and wailing of elephants. It was a bit out of the ordinary, but Wit ...

Infrasound is too low-frequency for humans to hear. It has been mistaken for ghosts, has been known to cause nausea and headaches in humans, and is used to monitor the testing of nuclear weapons. It’s ...

Sometimes, the most important sounds are those that cannot be heard. Take infrasound—acoustic waves below the range of human hearing. Although nuclear weapons blasts, midair meteor explosions, ...

Along the coast, waves break with a familiar sound. The gentle swash of the surf on the seashore can lull us to sleep, while the pounding of storm surge warns us to seek shelter. Yet these are but a ...