Why is nose snot is good for your lungs, and how to make electricity from hairy legs! Dave Ansell is also one of the Naked Scientists (see our previous podcast), and he's always out and about at the Cambridge Science Festival with the CHaoS crowd, bringing exciting science to a young audience! In case CHaoS doesn't mean anything to you - check out the CHaoS movie and other movies from the Cambridge Science Festival at http://www.sciencelive.org/content/view/65/52/