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Wolfram Alpha

Wolfram Alpha is endlessly facinating. For example, I learned a little trivia factorid today that my wife and I were both born on a Thursday [by putting our birth dates into Wolfram Alpha and comparing them.] It also instantly computed that someone with the equivalent of my current salary would have been making about $23,000 / year in 1946 when I was born. There is a great list of examples here.
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