And yet it seems that we're losing the coffeehouse—less to the usual suspects like the Internet and Dunkin' Donuts than to our own politeness. We've brought the noise level down to a whisper and are in the process of losing even the whisper: Enter the modern cafĂ© and the loudest sound you'll hear will be someone typing, in ALL CAPS, an angry blog comment. We've become a nation of coffee sophisticates—to the point where McDonald's feels compelled to roll out some semblance of an espresso program—but we're still rubes when it comes to the real purpose of the place: It's not the coffee. It's what your brain does on it