In 1885, an English scientist, Lord Rayleigh, had hypothetically shown 3 that waves could be propagated over the plane boundary between a vacuum (or an adequately rarefied medium, air for example), ...

There’s a connection between wave types that scientists once thought were fundamentally different.

Schematic of the experiment. The black loudspeaker on the right of the frame generates sound waves while a microphone moves along the grating to measure the propagation of the waves. Credit: ...

The noise created by the Earth's movements has been used to build up a detailed picture of the geological conditions beneath the Greenland Ice Sheet and the impact on ice flow, in new research. The ...