No surprise here: College towns are prime spots for readers, according to a new study released today by Amazon. The online giant ranked Cambridge, Mass., home to Harvard and MIT, as the country's most well-read city. In second place was Alexandria, Va., which hosts George Washington University. Amazon's list of the top 20 most well-read cities of populations 100,000 or higher was based on the retailer's print and digital sales per capita of books, magazines and newspapers. The rest of the top 10: