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Featuring collage of mushrooms and butterflies in a whimsical garden
it develops children
while tread tyres round off the picture
uniquely weighted pieces with stacking base are gratifying to hold
Springbots: 3-in-1 Spring-powered Machines tgtgho17pg16 Featuring collage of mushrooms andBuild a motorized robot, race car, and countdown timer, all that run without any batteries or electrical power! The secret behind these fascinating machines is a power source called a mainspring, a spiral shaped spring that stores up energy when wound up by hand, and then converts that stored energy back into motion when it discharges. The mainspring inside the robot turns gears which enable it to march forward on two legs. The race car zooms across
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