Google today unveiled its new Nexus 7 tablet at a special event hosted by Android and Chrome chief Sundar Pichai. The tablet isn't a surprise, thanks to a handful of early leaks, but it is an impressive device nonetheless. The Android 4.3-powered tablet ups the ante on screen resolution in a big way with a 1920x1200 display, giving it 323 PPI pixel density, much greater than that of the more expensive iPad mini.More...