In Pictures: The evolution of the tablet PC

We live in explosively innovative times for tablet computing and mobile apps. But it didn't all happen overnight. Most attempts to build a tablet-like computer, going back to the '70s, were not successful. Yet every failure was a lesson learned that led us to the iPad. Here's a look back at how the modern tablet came to be.

Barnes & Noble Nook Tablet (2011)

Nook is a touchscreen tablet sold by Barnes & Noble that expands on the Nook e-reader to compete with other 7-inch tablets such as the Kindle Fire and the Google Nexus 7. Like the Kindle Fire, the Nook runs on its own customized version of Android and its own customized Nook Store for apps and content. It is priced about the same as the Kindle Fire and it's worth noting that Barnes & Noble is scheduled to release new Nooks next month in the same vein as the new Kindle Fire HD devices (7-inch and 9-inch models).

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