Do you think you could make an echo at Echo Point in Katoomba?
When a sound is made, it spreads. And when it hits a hard surface that is far away, it bounces back and comes back to where the sound was made. That's what we call an echo.
Data from hydrophones in the Indian ocean has raised new questions about what happened to MH370.
The aftermath of the 2011 tsunami in Fukushima, Japan.
A new method of analysing underwater sound waves has led to the creation of a faster, more informative tsunami early warning system.
A new method has been developed to find objects that land at sea using underwater sounds.
Using sound waves to disrupt sensor functions is just one of a growing number of "side-channel attacks" that could affect our devices.
Sonic weapons usually leave no physical marks but can be devastating psychologically.
From Long Range Acoustic Devices used to disperse protesters to ear-splitting military drones to songs blasted on rotation to prisoners, ours is an age in which sound has been repositioned as a tool of terror.
The author began hearing the sound at night, between the hours of 10 and 11 p.m.
'Street' via www.shutterstock.com
Shortly after Glen MacPherson started hearing strange humming noises, he created the World Hum and Database Project so people around the world could document their own experiences with the Hum.
We find them at the beach, in every sound and light show, the miracle of wi-fi and now in the fabric of space-time itself. But what exactly is a wave?
Boom ting. The Super Hornet.
Going faster than the speed of sound can create some exciting effects – and it's not just aircraft that do it.
Urban noise pushes birds to sing in high pitch and ship sound deafens whales and dolphins.
John Haslam, Eric Bégin, IK's World Trip, Green Fire Productions, flickker photos, Jay Ebberly / Flickr
Noise pollution, whether on land or under water, can affect animals in interesting – and not always positive – ways.