Is the dark really making me sad?

Scandinavians have been trying to find innovative ways to capture sunlight for more than a century in order to combat seasonal depression. Linda Geddes delves into the disputed relationship between mental health and the sun

What the critics say about treatment for transgender children

To children who feel they were born with the wrong gender, medical intervention is available at younger ages than ever. Proponents of this say it supports mental wellbeing and helps avoid horrendous complications in later life; opponents argue that young people are not equipped to make such momentous decisions