Product%20Description%3ABuild%20a%20motorized%20robot%2C%20race%20car%2C%20and%20countdown%20timer%20–%20all%20that%20run%20without%20any%20batteries%20or%20electrical%20power!The%20secret%20behind%20these%20fascinating%20machines%20is%20a%20power%20source%20called%20a%20mainspring%20–%20a%20spiral-shaped%20spring%20that%20stores%20up%20energy%20when%20wound%20up%20by%20hand%2C%20and%20then%20converts%20that%20stored%20energy%20back%20into%20motion%20when%20it%20discharges.%20The%20mainspring%20inside%20the%20robot%20turns%20gears%20which%20enable%20it%20to%20march%20forward%20on%20two%20legs.%20The%20race%20car%20zooms%20across%20the%20floor%20as%20its%20mainspring%20uncoils%20and%20turns%20its%20wheels.%20The%20countdown%20timer%20uses%20a%20more%20complex%20system%20of%20springs%2C%20gears%2C%20ratchets%2C%20and%20linkages%20to%20slowly%20tick%20down%20the%20seconds%20as%20it%20discharges%20–%20for%20a%20countdown%20of%20up%20to%20six%20minutes.%20As%20you%20assemble%20these%20models%20one%20at%20a%20time%20from%20over%20130%20pieces%2C%20you%20will%20learn%20about%20the%20inner%20workings%20of%20spring-powered%20devices%20like%20wind-up%20toys%20and%20ticking%20mechanical%20clocks.Discover%20the%20physics%20concepts%20of%20potential%20and%20kinetic%20energy%20as%20you%20experiment%20with%20your%20spring-powered%20machines.%20Easy%2C%20snap-together%20assembly%20requires%20no%20glue.%20The%20kit%20includes%20step-by-step%20illustrated%20instructions.%2B%203-in-1%20engineering%20kit%3A%20build%20three%20self-powered%20models%2C%20then%20wind%20them%20up%20and%20watch%20them%20go!%2B%20Learn%20about%20potential%20and%20kinetic%20energy%20and%20how%20gears%20and%20springs%20function%20in%20different%20mechanical%20devices.%2B%20Race%20car%20drives%20up%20to%2045%20feet.%2B%20Robot%20walks%20on%20two%20legs%2C%20up%20to%2020%20inches.%2B%20Timer%20counts%20down%20from%20up%20to%206%20minutes.%2B%20No%20batteries%20or%20electricity%20requiredProduct%20Information%3AAges%3A%206-14%2B%20Experiments%3A%203Piece%20Count%3A%20133Manual%20Pages%3A%2064%20(also%20available%20to%20download%20on%20thamesandkosmos.com)Product%20Dimensions%3A%2010%20x%2011%20x%202.5%20in.Product%20Weight%3A%200.9%20lbsManual%20Dimensions%3A%205.5%20x%208.25%20in.Batteries%20Required%3A%20N%2FACountry%20of%20Origin%3A%20TaiwanYear%20Released%3A%202021NGSS%20Correlations%3AK-2-ETS1%20Engineering%20Design2-PS1-3%20Matters%20%26amp%3B%20Interaction3-5-ETS1%20Engineering%20Design3-PS-2%20Motion%20and%20Stability%3A%20Forces%20and%20InteractionsMS-PS2-2%20Motion%20and%20Stability%3A%20Forces%20and%20InteractionsMS-PS3-5%20Energy