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
Is the current epidemic of depression and hyperactivity the result of disease-mongering by the psychiatric profession and big pharma, asks Will Self. Does psychiatry have any credibility left at all?
Russell Foster: Biological clocks are known to schedule sleep and changes in alertness, mood, strength and blood pressure, but recent studies suggest they are also deeply involved in mental health