doesn't perform that sort of deduction. If you ask "How fast does hair grow?", it can't parse or answer that query. But if you type in a speed, say "10cm/year", it gives you a long and quite interesting list of things that happen at about that speed, involving glaciers melting, tectonic shift, and... hair growing.<br /><br />This brings up the final issue I wanted to discuss: how much of what it returns does it understand. At one extreme is, say, Google, which responds to almost anything like a faithful pup