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Son: Daddy, why do people exist?
Me: I don't know. We just do.
Son: Someone must know.
Me: No one really knows why. A lot of people are trying to find out, but no one has found the answer.
Son: I bet Google does. All you do is go to Google and type in the question.
Me: !! But how does Google know !!
Son: That's because God told Google.
At this point I thought of explaining how search engines work to him, but it was so funny that I fell apart laughing.
As a bonus, it will be extremely cool if it is something which she can take into school on a USB stick and actually run a demo without having to install anything on the school machines. All her school machines are Windows machines.