Why do mosquitoes prefer to bite some people over others? What happens to the body when it faces extreme cold? What is best to lower body temperature, cold or hot beverages? Why does it hurt so much to get pricked with a needle? Rafael Cortez will be our guide in this scientific quest to answer these questions. With five guinea pig testers who will participate in fun experiments. -- Originally named "Voluntários Shorts: Tudo É Pela Ciência"