IN GREEK mythology, Echo was a mountain nymph who lost her voice and was condemned to repeat only the words of others. Now science is poised to silence the sprite completely. A group of physicists, ...

Echoes occur best with hard, smooth and large surfaces are required for that reflection. Rock, cement, marble, and glass are ...

Reverberant sounds made in an empty environment are the result of sound waves bouncing off hard, flat surfaces, as governed ...