One cool thing about 3rd grade - the solar system. And when you are in my 2/3 combo, you also get it in 2nd grade. My kids loved everything about it. We also wrapped up our unit on a trip to the planetarium. Good fun for all. Thanks to Meg for getting me my out of this world mobile. And I'm very thankful for my classroom neighbor, Judy, who lent me every solar systemy thing she had acquired over the past 20 some years.