"And I thought so, too, at first.  I led them to think so.  But, Jubal, I had missed a key point:  Humans are not Martians.  I made this mistake again and again - corrected myself... and still made it.  What works perfectly for Martians does not necessarily work for humans.  Oh, the conceptual logic which can be stated only in Martian does work for both races.  The logic is invariant... but the data are different.  So the results are different."