This series in NSTA Reports is based on the NSTA Press book Thinking Scientifically About Controversial Issues: Clones, Cats, and Chemicals. The book examines 10 dilemmas from the fields of biology, chemistry, physics, earth science, technology, and mathematics to help challenge students to confront scientific and social problems that offer few black-and-white solutions. It provides the facts and the framework to provoke classroom debates.