An interesting observation in that apparently if you have URL text data in your clipboard buffer, and you paste into Vista’s Windows Calculator (calc.exe) it pastes as pi?

If I copy the text  "http://thisisnotpi.com" and paste it into calc.exe you get pi:

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If you have "This is Not Pi" in your buffer and paste it in, you get "Invalid input for function":

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Useless oddity, but just an accidental mis-pasting of what I thought was last in the buffer 🙂