Preparing to hunker down for the cooler months? Feeling gloomy about the end of summer? Stop right there! If Susan’s last post on Vitamin D and dementia didn’t get you up and out, then tune in to this week’s BBC Horizon programme (http://www.bbc.co.uk/iplayer/episode/b04g507y/horizon-20142015-5-allergies-modern-life-and-me) on the explosion of allergies in the developed world. Horizon covered not…