Remember all those five pound textbooks you carted around school? They were a test of character – or of your spine. Now they may be coming to an iPad. Fast, light, and probably still really, really expensive. Plus, here's some friendly advice: don’t read your textbooks while you're walking! Put down the device! People engrossed in their smart phones and iPods have been killed in traffic because they’re not paying attention. Next time at one o’clock.