Last week, The Economist ran a really fas­ci­nat­ing arti­cle on recent research into the evo­lu­tion­ary ben­e­fits of depres­sion.  Why do we get depressed?  Why did such a trait come to be, and if it’s so detri­men­tal to our health, why hasn’t it been selected against in the pop­u­la­tion? Dr Nesse’s hypoth­e­sis is that, as pain […]