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I asked Google how many seconds in a year and it instantly told me: 31.5 million. That means that today 14,000 searches are performed on the web every second. Considering the web as its own global machine, search is running at 14 kilohertz. If we could audibly hear each click of the mouse as everyone searched, the resulting sound -- vibrating at 14 kilohertz -- would be a high pitch hum right at the edge of human hearing. Hear it, hmmmmmm?
http://www.kk.org/thetechnium/archives/2007/10/how-much-does-o.php