Create%20a%20large%20swooping%20rollercoaster%20with%2027%20feet%20of%20track.%20Send%20marbles%20racing%20through%20the%20course.%20Includes%204%20marbles%20and%20detailed%20instruction%20booklet.%20A%20truly%20unique%20marble%20run!%20Watch%20the%20marbles%20accelerate%20down%20steep%20slopes%2C%20climb%20uphill%20almost%20to%20a%20stop%2C%20roll%20quietly%20along%20flat%20plateaus%2C%20before%20racing%20down%20another%20chilling%20plunge%20at%20full%20speed.%20Ideal%20for%20demonstrating%20principles%20like%20velocity%2C%20acceleration%2C%20gravity%20%26amp%3B%20friction.%20Includes%20marbles%20of%202%20different%20diameters%20and%20weights%20to%20experiment%20the%20effect%20of%20physics%20forces%20along%20the%20track.%20Contents%20include%3A%2025%20pillars%2C%2024%20joints%2C%2018%20supports%20and%20junctions%2C%2036%20track%20connectors%2C%206%20base%20pieces%2C%208%20marbles%2C%2012%20curved%20tracks%2020%20straight%20tracks%2C%201%20instruction%20manual%20with%20examples.%20Quercetti%20has%20been%20creating%20and%20manufacturing%20educational%20toys%20in%20itally%20for%2065%20years.%20Quercetti%20has%20contributed%20to%20generations%20of%20children%20engaging%20in%20beneficial%20play%20that%20encourages%20creativity%20and%20stimulates%20intuitive%20reasoning.