When you speak softly in one of the galleries of St Paul's cathedral, the sound runs around the dome and visitors anywhere on its circumference can hear it. This striking phenomenon has been termed ...

Lasers work by emitting light that is “coherent” in that it doesn’t spread out in a disorganized way like light from most sources does. This makes extremely focused beams possible that can do things ...

Researchers from MIT have discovered a way to send highly targeted audio signals directly to someone's ear at a distance using laser beams. The system works using the "photoacoustic" effect, where ...