It's tapping your foot to a song on a radio. It's clapping your hands with the crowd at a game. It's rhythm, an internal sense of timing that has been linked to more than just good dance moves.

WESTON, Fla. (AP -- Left foot. Right foot. Left foot. Right foot. Fifty-four times a minute, 8-year-old Patrick Vermillion steps onto an electronic pad in time with the computerized metronome beeping ...

The heart beats rhythmically, and so does a metronome. So it makes sense that a metronome, typically used by musicians to help keep a steady beat, could help medical professionals restart a heart. For ...