Last week I had a patient divulge to me that she wasn't too bothered about her wrinkles. She was having botox for her depression. This isn't the first time I've met such a client so I decided to do a bit of investigating into this latest use of the wonder drug. This journey takes us all the way back to the father of evolution: Charles Darwin. Darwin proposed that facial expressions feed information back to the brain. In simpler terms, when we feel unhappy we frown, but frowni