A special ‘Chemistry Crime Scene’ investigation took place on Saturday at St. Mark’s High School in Wilmington, where teams of students participated in the annual Elementary Science Olympiad. Some 500 students were challenged to execute experiments in such categories as Light and Mirrors, Egg Drop, and Chopper Challenge. Independence, St. Edmond’s, St. Elizabeth, Sanford, Ursuline, Tower Hill and Wilmington Friends were among the 20 independent and Catholic schools that participated. Click here for Olympiad results. ”This competition is a great way for us to stimulate enthusiasm in science and math,” said Sanford Science Teacher John Bell.