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 ...

Visitors to Saint Paul’s in London are often astonished by the cathedral’s whispering gallery, where words spoken in a whisper along the curving wall of the dome can be heard anywhere along that same ...

Left: The green fluorescence shows light trapped around the circular cavity, displaying the whispering gallery effect. Right: Laser light collected from the microlaser shows only a single color or ...