Check out Hack a Day's page on do it yourself Transistor fabrication. True NMOS transistor. (closest I've ever done this was with magic, though the resulting output was a -bit- smaller.
Includes videos explaining the process, and what to do. Very good presentation!!! Hats off to Mike Szczys and Jeri Ellsworth for putting this together!
Ok, so as mentioned in the comments: "Hydrofluoric acid… 1000 degree oven… a child can do it…". Maybe not "any" child.... But none the less, very cool.
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