Growing up in Florida, I had a weird allergy: the sun. Walking outside, coming from from a typically cool, dark indoor place, I'd invariably sneeze -- sometimes twice. It happened to my father too, causing a strange family multi-sneeze spectacle whenever we'd leave a movie. For me it was just one or two sneezes, then all better. What caused this? I always assumed there was something about bright light that disagreed with my bookish, "indoor kid" nature. Apparently I was right; today I learned that... READ ON