Students from Bloom Trail High School District 206 in Chicago Heights brought their Motion Minus Petrol hands-on alternative energy fair to Sandburg Middle School in Elmhurst Wednesday. About 100 Elmhurst students from Bryan, Sandburg and Churchville middle schools learned about alternative energy sources from the students in Bloom Trail’s Chemistry Club. The event was sponsored by Elmhurst Unit District 205's Reach program and the PTA. While Sandburg’s cafeteria buzzed with activity as students huddled around exhibits on wind, biodiesel, solar and ethanol energy sources, the favorite …