This month Science on Screen features selections from the Bell Museum and Minnesota Film Arts' second annual Nature Film Challenge. Filmmakers are invited to submit original short films in any style or genre that explore ideas about nature and experiences with the natural world. Creativity is encouraged, and first-time filmmakers are welcome to submit! Submissions will be screened, along with local favorites and last year's audience choice winner, at the Bell Museum Auditorium, 17th & University SE, Minneapolis; 612/624-7083; For submission guidelines and details, visit www.bellmuseum.org.