By all measures, this generation of American kids (ages 3 to 18) is the tech-savviest in history: 27% of them use tablets, 43% use smartphones, and 52% use laptops. And in just a few weeks they will start the most tech-saturated school year ever: Los Angeles County alone will spend $30 million on classroom iPads this year, outfitting 640,000 kids by late 2014.