You may have seen this item a bunch of times and found it quite intriguing. It's a set of metal spheres hung close together, and when one is swung against the others, they swing back again like a pendulum. Newton's theory of 'equal and opposite reaction'. Remember it now? A Newton's Cradle makes a nice addition to a work desk or study area. It's great to pass the time or take your mind off things. And let's face it, it's kind of fun.
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