Rattle Back Puzzle 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. Not new, but we got a supply of these at an amazing low price - less than what you would pay for one decent cigarette ! And this won't spoil your health, or go up in smoke - it will keep you amazed and amuse...