Cognitive 'canaries in the coalmine'? Studies of people born since 1995 — the first group to enter their teens with smartphones, tablets, and persistent connectivity, have found that teenagers were consuming media, including text messaging and social networks, for an average of nine hours a day. 

If screens are kept at an arm’s length, measures of well-being tend to improve.

People may think of millennials as being one ‘right swipe’ away from a quick hookup through dating apps, but a study suggests many 20-somethings are actually having less sex than their parents did back in the day.