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Students have always faced distractions and time-wasters. But computers and cellphones, and the constant stream of stimuli they offer, pose a profound new challenge to focusing and learning.

“Their brains are rewarded not for staying on task but for jumping to the next thing,”

Unchecked use of digital devices, he says, can create a culture in which students are addicted to the virtual world and lost in it.

Aristotle concluded more than 2,300 years ago that "the young are heated by Nature as drunken men by wine."

"We're so used to seeing adolescence as a problem. But the more we learn about what really makes this period unique, the more adolescence starts to seem like a highly functional, even adaptive period. It's exactly what you'd need to do the things you have to do then."

Teens take more risks not because they don't understand the dangers but because they weigh risk versus reward differently: In situations where risk can get them something they want, they value the reward more heavily than adults do.