Nov. 7, 8, & 15. All invited to turn everyday household recyclables into a gravity-defying, high-speed mini roller coaster to carry a marble down a track. 11 a.m.–3 p.m., 220 E. Ann. $16 museum admission (babies under 2, free). (734) 995–9439, discoverscienceandnature.org/aahom.