Anaccidentaleventsoftencancauseascientiststhoughtflash.Thisis1666yearslatesummerawarmevening,inEngland,Lincolnstateurthorpe,onewithabookunderhisarmoftheyoungmanwalkedintohismother'sgarden,sittingunderatree,andbegantohisreadinghisbook.Whenheturnedthepages,thetopofhisheadinthebrancheshavesomethingshookup.Oneofhistory'smostfamousapplefelldown,hitthe23-year-oldNewton'sheadhappentobeinthatday,Newtonisthinkinghardwithaquestion:whatisthestrengthtokeepthemoonaroundtheearthintherunningtrack,andmaketheplanetorbitsthesuntokeepinitsorbit?Whythisonlystruckhimintheheadwithapplewillfalltotheground?Itwasfromthinkingtheproblembegan,hefoundtheanswer--histheory.:applefellandaplanetarounddaywilltheuniversedominatedbythesame?Heiscorrect.Andthenthereisaremarkablework"themathematicalprinciplesofnaturalphilosophy"
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