"I suspect a top is one of those things that wants to be invented," Physicist Robert Greenler suggests as he spins fruits and vegetables—nuts, a strawberry with a twig stuck through it, a lemon, an apple on a stick, a coconut, an acorn squash, a pumpkin—in this engaging program. It is both an explanation of Newtonian laws of motion and a celebration of human curiosity and resourcefulness.

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