Do you live in a college town? If so, chances are you're a big reader. Retail giant Amazon has announced its list of the "Top 20 Most Well-Read Cities in America." They tracked purchases of magazines, newspapers, books, and e-books since January 1 for cities with more than 100,000 residents. While Cambridge, Massachusetts, home of Harvard University and the Massachusetts Institute of Technology, is number one, the rest of the list is dominated by big college towns.