Just how feasible is moving every 30 minutes throughout the day? We caught up with exercise scientist Keith Diaz to talk through the benefits and challenges, along with tips for combating our culture of sitting most of the day. Are you also doing the TED Talks Test this week? Comment below and let us know how it’s going.

For years, the warning has been: smartphones are destroying a generation. But developmental psychologist Candice Odgers says that decades of data on teens tells a different story — violence, alcohol use and pregnancy are at historic lows, and research shows social media may not actually be the culprit for mental health problems. Hear her analysis of what’s really troubling kids these days, and why banning them from online spaces may make things worse.