You read the book. You saw the movie. Now try the applet.
© Please note that John R. Koza is the original author of the algorithms used here.
You may want to check out his book "Genetic Programming: On the Programming of Computers by Means of Natural Selection" (ISBN 0-262-11170-5).
Loading the applet into your browser will take less than a minute on a good 14.4k modem link.