Every Sat. & Sun. (except Mar. 19). Hands-on 20-minute family-oriented demos for ages 5 & up. “Life: How Do We Find It?” (11 a.m.) features a re-creation of an experiment from the Mars Viking Landers expedition to show how scientists search for life on other planets. “Shedding Light on Magnets” (3 p.m.) explores magnetism, magnetic fields, and what magnets have to do with cell phones. 11 a.m. & 3 p.m., U-M MNH, 1105 North University. Free. 764–0478.