This fan-fic is not mine, but it is the best fan-fic I've ever read, by far.
It's an alternate version of Harry Potter in which his adoptive parents raise him to be a young prodigy at science and rationalistic thinking. So if you liked Harry Potter but would love to see it involve more of the scientific method, Bayesian theory, and dozens of other Muggle systems of science and thinking, then friggin' read it.
Nearly 700,000 words and still going.
http://hpmor.com/
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