This is the first "creation in the Klutz lego Chain Reactions book Already teaches about axels ramps friction etc! Takes about 10 minutes and could be a wonderf…
Amazon.com: LEGO Chain Reactions (Klutz Science/STEM Activity Kit), 9" Length x 1.06" Width x 10" Height : Pat Murphy and the Scientists of Klutz Labs: Everything Else
Lego Chain Reactions : Pat Murphy : 9780545703307 : Blackwell's
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Klutz LEGO Chain Reactions Kit | A Mighty Girl
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