Numb3rs is a pretty cool series, I love it, but I have to say that I was very disappointed with the lack of truth when it comes to History. To say the least, a brainy soul like Larry would never mistaken the Aztecs with the Incas and say that the former had used quipus as their writing system, instead of the latter! Any of my students knows that! So, that's the biggest flaw ever that I've encountered and made me pretty upset, even though I still love the show and the math ingenuity it implies to solve the cases. Maybe in the future you should consider employing some one more knowledgeable in History as a consultant?