Meet natural history museum curator Mark Siddall in these videos from NOVA's "The Secret Life of Scientsist and Engineers." Mark travels the world finding animals for study and his library of biodiversity. He tells us that a prized find was a leech that only lives in the rectums of hippos. Go figure. When he is not conducting his research, he enjoys cooking. This resource is part of the NOVA: Secret Life of Scientists & Engineers Collection.