STONY BROOK - Students at a Setauket school participated in an international science competition today sparked by actor Alan Alda. The contest, spurred by an article Alda wrote in the Journal of Science, urges scientists to explain what a flame is using terms an 11-year-old would understand. More than 130 schools from around the world expressed interest in the event, including Setauket Elementary School. Alda spoke to the students through a television studio set up at nearby SUNY Stony Brook, and showed presentations put together by each school. "I thought it would be fun to ask scientists to explain it so an 11-year-old could understand it," says Alda. The winner of the Flame Challenge will be honored at the World Science Festival on June 2 in New York City.