The drug-like effect of screen time on the teenage brain 

Teenagers today have never known a world without the internet, which may be why half of all adolescents say they’re addicted to their digital devices. In her new documentary “Screenagers,” Dr. Delaney Ruston explores why young people are so drawn to social media and video games and what effect it’s having on their brains. Ruston joins William Brangham to share what she’s learned.