MindThere's a dark side to self-control. Here's why you should loosen up Willpower is the secret of success – or so we've been told. But too much can be bad for the body and mind. The trick is to know when to give in to temptation Features
HumansTrolley problem tested in real life for first time with mice Would you kill someone to save five others? The first lab enactment of this classic thought experiment raises issues for how we programme self-driving cars News