Seriously, though, the Doppler Effect refers to the phenomenon that is observed when the source of a sound (or any other wave) is moving with respect to an object. That object could be you. The result is a perceived change in the intensity of the sound as the source keeps on moving.
There are many applications of the Doppler Effect, and one of the newest applications which may be of particular interest to you guys is gesture control for computers. [Read more…] about Control Your Computer Using the Doppler Effect