These packet mixers are the things that route data packets to the proper Internet
channel. They are customized versions of wind turbines, altered to stir data, not
air. Despite advances in sound-control technology, they emit a pleasant whine
as the stirring blades revolve in a circle.

Scientists have studied this problem for years. Outside consultants, including author
Ray Bradbury, have been here to try to unravel the secret behind the noise and to
develop a solution. Bradbury, who was amused by the noise, dubbed it "dandelion whine."