A popular scientific novelty, this is a boat shaped piece of plastic that you can spin by flicking one end with your fingertip, so it spins clockwise. Then it stops, and spins back on its own, anti clockwise, in a most intriguing way. It will keep you amazed and amused, and even educate you in Newtonian Physics when you learn how and why it works! Demonstrate Newton’s three laws of motion with the flick of a finger. Due to its offset center of gravity this scientific curiosity has a preferred direction of rotation — it wants to spin counter-clockwise. Its spin bias is so strong that when it is spun clockwise, it will turn through a few rotations, stop, “rattle” (or rock up and down on its long axis), then automatically reverse itself and spin counterclockwise. The Rattleback is so unique that it has been written about in Scientific American.  (Colors may vary.)