Every action has an equal but opposite reaction - right before your eyes!
Newton's Cradle is fun as well as scientific. Also known as balance balls, these steel balls keep you entertained throughout the day. Pull back one or more of the balls and let it go and watch each end marble bang back and forth for endless fascination.
Great not only for kids but adults can keep it on their desk at work or home for some relaxing fun.
Recommended Ages: 5 to 93!
Dimensions: 4-1/4 x 3-1/2 x 4-1/2 inches