By Todd Bernhard
When the original iPhone was introduced, Alan Kay, who conceived of the Dynabook, told Steve Jobs, who asked if it was good enough to criticize, "make the screen five inches by eight inches, and you'll rule the world." Little did he know that Apple started out working on a full-size tablet, but shelved that to release the iPhone in 2007. When the first iPad finally came out in 2010, it was heavy, had no camera, and had a large bezel. Apple has done a remarkable job enhancing the iPad product line, making it bigger, smaller, thinner with each iteration.