HumansThe 5 worst ideas of the 21st century – and how they went wrong They offered so much promise, but ultimately turned sour. These are the most disappointing ideas since the turn of the millennium Features
MindWhy do I feel lonely even when I'm surrounded by a festive crowd? Feeling alienated in others' company, or "existential isolation", can happen to us all. David Robson digs into the psychological literature for a solution for one reader Regulars