A science curiosity whose mysterious properties capture the attention of all ages. It has natural spin bias. With a flick of the finger you can demonstrate Newton's Law of Motion. Place the Rattleback on a hard, smooth, level surface with the elliptical side down, lightly tap one end, the Rattleback will rotate in a direction.
USA Rattleback - SGD 8.50
http://www.youtube.com/watch?v=o2nURFQ-m5g&feature=related
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