At the Mt. Diablo School District science fair for students in grades 3-5, Michelle Fernandez, left, an adviser from College Park High School, listens as Anna Shin, 10, a fourth-grader at Fair Oaks Elementary School in Pleasant Hill, talks about her science project, "What Makes the Water Clear." The fair, co-sponsored by Diablo Valley Lodge 448 and Concord Chapter 384, of the Order of the Eastern Star, was held Saturday at the Willow Creek Center in Concord.