And then once the official lab activity was over, the unofficial experiments began. Some students decided to try adding more than one marble to the ramp. A group of boys created their own half-Newton's-Cradle-half-Jacks game. Another group decided to design their own Rube-Goldberg type of device, where they drop the ball off the highest point on the ramp, bounce it along a series of desks, and land it inside a trashcan fifteen feet away.
They continually remind me how much learning can happen when the other "official learning plan" gets out of the way.