For centuries, the reflections of light or sound have been theorized. Scientists have always thought of another variable: ...

Sound waves can reflect off surfaces. We hear reflected sound waves as echoes. Hard, smooth surfaces are particularly good at reflecting sound. This is why empty rooms produce lots of echoes. Soft ...

Kajima Corp., a major construction company, created the 3D acoustic speaker "Opsodis 1" using technology from its advanced anechoic chamber -- a space designed to absorb sound reflections completely.