2: A River, by Marc Martin, and Rube Goldberg machines

We watched the OK GO Rube Goldberg video, and read A River, which tells a tale of a boat meandering through different terrains: a city, a jungle, mountains. Then we made a chain reaction machine that went through two rooms of NuVu. Though there were some glitches, the kids were determined to make the machine work, and the end result was pretty spectacular!