Pete Etchells: On the one hand, anxiety is a serious and debilitating disorder. On the other, it can be a useful evolutionary response to threat. Understanding how anxiety works might help to destigmatise mental health issues
You mentally undress your friends, Tony Blair, the lollipop lady. Your thoughts are X-rated. You wonder if you're a paedophile – or just losing your mind. Rose Bretécher describes the nightmare – and dark comedy – of living with pure OCD
Pete Etchells: A recent briefing from Public Health England warns that too much screen time is causing emotional problems in children. But is it that simple?
Tom Meltzer: From TED talks to online seminars, video channels crammed with inspirational and thought-provoking lectures are educating us on everything from town planning and depression to body language, animal morality and dangers of sugar in just a few minutes. Here is our pick of the best