How do those virtual mind readers work?

I'm sure it's just a math thing that I can't figure out. Does anyone know?

Here's a link to one in case you don't know what I'm talking about.

http://www.superlaugh.com/1/flashmindrea...

Answer:
..When you do the math, no matter what number you choose, it always comes out to the same symbol. No mind reading involved.
Its compounded by many years of Profiling, and they get it right on most of the time, like say a FBI pro-filer will say for (Example) Person is white Early 20's a Loner and was mean to pets( sample) like that ,years and years of profiling experience and by rule and thumb so much stuff has been calculate and recorded over the years, so much that it can be programed into a processor and out comes the answer, and its a well educated Guess

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