Uffish: I undid your redirect of Percolation from an edit you made on may 4th, because you didn't edit the Percolation_theory page to account for the information that was in the Percolation page.  In fact, it created a circular reference in the Percolation_theory page.  I'm not opposed to the redirect, but the material needs to be folded into the theory page before the redirect is done.