LEGO Chain Reactions (Klutz Science/STEM Activity Kit)
Nappa silver award winnerDesign and build 10 amazing moving machines - teach your bricks new tricksComes with 80 page instructions, 33 LEGO pieces, Instructions for 10...Includes a 80 page instructional book with Klutz Certified crystal clear...Includes more than 30 essential LEGO elements
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