This week brought news of a major innovation in the book-publishing world. And Amazon had nothing to do with it. Harvard Book Store in Cambridge, Massachusetts, unveiled the new $100,000 Espresso Book Machine, a publishing device that can print a paperback book at the push of a button. The machine is pretty incredible: It can print a professionally bound book in four minutes for about $8! Book lovers can request a tome that’s not in the store’s inventory and the Espresso can print it while they wait. Customers can also order books online and pick them up in the...