Establish an e-day, which means when you start and stop your immersion in the digital realm (I know it's hard, thanks to the cloud).

Asked what's on his iPad, Flake e-mailed: "I have a 'notepad' app that I checked the other day."

China has also taken steps to protect the students' eyesight, such as larger printing in students' textbooks, at least two hours' outdoor activities a day, regular eyesight checking, less time on E-books and so on.