/* Emits a 7-Hz tone for 10 seconds.

  True story: 7 Hz is the resonant
  frequency of a chicken's skull cavity.
  This was determined empirically in
  Australia, where a new factory
  generating 7-Hz tones was located too
  close to a chicken ranch: When the
  factory started up, all the chickens
  died.

  Your PC may not be able to emit a 7-Hz tone. */