Remember when smart-aleck bloggers were asking what people would actually do with a tablet? Yeah, well, never mind. People seem to have figured out plenty to do with them. According to the Pew Research Center, nearly one-in-five U.S. adults now own a tablet or e-book reader. That’s nearly double what it was in the middle of 2011. Tablet ownership is even higher among college-educated adults, nearly one-third of whom know own one of the devices. That latter number is likely to go higher still if the preliminary results from Apple’s new digital textbook initiatives are any indication. Full results from the Pew Center research are available here.