Search reveals eight new sources of black hole echoes

Scattered across our Milky Way galaxy are tens of millions of black holes—immensely strong gravitational wells of spacetime, from which infalling matter, and even light, can never escape. Black holes are dark by definition, ...

The financial dangers of echo chambers

As ongoing revelations about Facebook's algorithm are showing, social media's ability to shape our attitudes by steering users into echo chambers is raising questions about our national discourse and drawing increasing attention ...

Moths use acoustic decoys to dodge bat attacks

In dark skies around the world there unfolds a nightly battle between bats and the nocturnal insects upon which they feast. You'd have thought bats, equipped as they are with echolocation, in which they navigate using sound, ...

'Bat-sense' tech generates images from sound

By cleverly analyzing the results, the algorithm can deduce the shape, size and layout of a room, as well as pick out in the presence of objects or people. The results are displayed as a video feed which turns the echo data ...

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