We all know we've had a digital revolution, but what is that? Well, Shannon took us, in the '40s, from here to here: from a telephone being a speaker wire that degraded with distance to the Internet. And he proved the first threshold theorem, that shows if you add information and remove it to a signal, you can compute perfectly with an imperfect device. And that's when we got the Internet. Von Neumann, in the '50s, did the same thing for computing; he showed you can have an unreliable computer but restore its state to make it perfect. This was the last great analog computer at MIT: a differential analyzer, and the more you ran it, the worse the answer got.