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).