How often have you watched an episode of Star Trek: The Next Generation, and thought, "Man, I love the sound of that engine."
Me, neither. But someone nicknamed crisknife007 did, and he extracted a sample to turn it into a video that plays the Enterprise's ambient engine noise for a full twenty-four hours.
After listening to it, I have to agree it's kind of soothing. I bet Picard and Worf slept like babies with that in the background.
The video is embedded below, but I doubt you'll want to listen to the whole 24 hours here.
[YouTube via TrekWeb]