The origin of light will be explained through a number of experiments during the Saturday, March 15, CU Wizards show "The Chemistry of Light." Kathy Rowlen, a chemistry and biochemistry professor at the University of Colorado at Boulder, will present the show at 9:30 a.m. in the Cristol Chemistry and Biochemistry Building, room 140. The show, aimed at students in grades five through nine, is free and open to the public.