Technology Phased introductions to smartphones will help kids more than bans Creating "walled gardens", much like TV channels do, would provide children better tools to navigate a lifetime of social media than banning smartphones altogether News
Mathematics Mathematicians discover impossible problem in Super Mario games Using the tools of computational complexity, researchers have discovered it is impossible to figure out whether certain Super Mario Bros levels can be beaten without playing them, even if you use the world's most powerful supercomputer News
Health Martin Rees: Why challenge prizes can solve our most pressing issues As the winner of the Longitude prize on antimicrobial resistance is announced, chair of the prize committee Martin Rees, the UK's Astronomer Royal, explains why it pays to reward ideas News
Earth Photos of a rusting Alaskan river win New Scientist Editors Award Taylor Roades's images of a river in north-west Alaska that has turned orange because of global warming have won the New Scientist Editors Award at the Earth Photo competition Regulars
Society Why humanity’s survival may depend on us becoming a tribe of billions Tribalism can be toxic, yet we need more of it if we are to meet today’s global challenges, argues one anthropologist. His research reveals how to create a “teratribe” Features
Comment New book explores how games shape the world – for better or for worse From chess to nuclear war planning, Kelly Clancy takes a wide-ranging look at how games and gaming have changed society in Playing With Reality Culture
Health Dear David: How do I help my daughters deal with their social anxiety? In his evidence-based advice column, David Robson has some ideas for a reader worried about his daughters’ social anxiety. Self-compassion is key, he says Regulars
Is it a severed foot? No, it's a sea slug A foot-shaped piece of flotsam has caused confusion among forensic scientists – but Feedback is relieved that the matter was cleared up thanks to that old stalwart, "examination" Regulars