From Tucker Carlson to Johnny Depp, a celebrity bromance is the must-have accessory for modern dictators, says Marina Hyde (1m50); the Libertines on feuds, friendship and their tortured reunion by Simon Hattenstone (9m03); and how habituation, a simple behavioural trick, can help you experience less pain and more pleasure by Cass Sunstein and Tali Sharot (35m49).