Why can sunlight exposure induce sneezing?Achoo! Ever thought about why you sneezed when you stepped into sunlight? Well, this same question plagued even Aristotle himself, so much so that in The Book of Problems, he asked, “Why is it that one sneezes more after one has looked at the Sun?” His answer was that sneezing resulted from a chain of physical events in which the sun heated the nose, eventually triggering a person to sneeze. But, as you can probably guess, the story is a bit mor...