E-books realize their unbound potential faster than expected as pixels push past paper in Amazon sales. Oh, and, hey, look! Kindles for sale! Since April the first, for every 100 print-and-paper books Amazon has sold, it's also sold 105 e-books, according to a fresh Amazon announcement . Kindle e-readers arrived, along with a small but fast-growing digital bookstore, in November 2007--by July 2010, Amazon notes, Kindle book sales had surpassed hardcover book sales, and then six months later beat the paperback books sales rate
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