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【Areyouleft-handed?Ifyouareyoumakeupjust10percentoftheworld’spopulation.41Mostpeoplewriteandplaymusicalinstrumentswiththeirrighthands.Whyaresofewpeopleleft-handed?Anewtheorycalled“cooperation】
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Areyouleft-handed?Ifyouareyoumakeupjust10percentoftheworld’spopulation. 41 Mostpeoplewriteandplaymusicalinstrumentswiththeirrighthands.

Whyaresofewpeopleleft-handed?Anewtheorycalled“cooperation(合作)vscompetition”mayhavetheanswer. 42 Whenmakingtoolsforaright-handedperson—likeaknife—itwaseasierifeverybodycouldusethesamehand.Butsomehumanswantedtocompeteinstead.Sotohaveanadvantageoverright-handedpeopletheywouldusetheirlefthandtosurprisecompetitors.

__43 GermanbornAmericanscientistAlbertEinsteinBritishphysicistIsaacNewtonandBritishbiologistCharlesDarwinaresomefamous“lefties”.AtleastsixUSpresidentswereleft-handedincludingBarackObamaBillClintonandHarryTruman.

“Lefties”arealsooftenlinkedwithcreativityandvisual(视觉)skills.

Howcanthisbe?Welltheleftsideofourbrainiswherewesolveproblems.Therightsideofourbrainiswherewedevelopcreativity.Right-handerstendtousetheleftsidemorethantherightside. 44 “Thisiswhytherearemoreofthemincreativeareassuchasmusicartandwriting”saidAlanSearlemanPhDfromSt.LawrenceUniversityNewYork.

__45__.Theytendtohaveworsememoriesoftenforgettingnamesandplaces.

A.Whilethebodyissymmetrical(对称的)inmanywaysinsomekeyareasit’sdecidedlyone-sided.

B.Ashumansevolved(进化)weneededtoworktogethertolive.

C.Thismeansweliveinaright-handedworld.

D.Howeverit’snotallgoodnewsforleft-handers.

E.Whichmeansthatleftiesshouldcelebratetheirdifferences.

F.Yetleft-handerstendtousebothsidesmoreevenly(均匀)thanright-handers.

G.Althoughtherearefewleft-handedpeoplesomeofthemaregeniuses(天才).

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