About 500 years ago, when he wasn’t painting or sculpting people, Leonardo da Vinci was coming up with ways to move people around—maybe not immediately, but hey, the guy had vision. We have (3) pre-cut wooden models of these ingenious machines, which you or a kid can put together with a tad of glue that you provide, and a willingness to learn a little history plus the STEM concepts of levers and simple machines. Detailed instructions included. You pick: the bicycle, which measures approx 2-1/4” x 1-1/2” x 7” when assembled and has a spinning crankshaft; the aerial screw, which is sort of a pre-cursor to the helicopter with a canopy that spins on its support structure and measures approx 4-1/4” x 4-1/4” x 5”; or the ornithopter, which has flapping wings and measures approx 6-3/4” x 8” x 8-1/4”.