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TED英语演讲稿:我们为什么快乐
Whenyouhave21minutestospeak,twomillionyearsseemslikeareallylongtime
Butevolutionarily,twomillionyearsisnothing
Andyetintwomillionyearsthehumanbrainhasnearlytripledinmass,goingfromtheone-and-a-quarterpoundbrainofourancestorhere,Habilis,tothealmostthree-poundmeatloafthateverybodyherehasbetweentheirears
Whatisitaboutabigbrainthatnaturewassoeagerforeveryoneofustohaveone
Well,itturnsoutwhenbrainstripleinsize,theydon'tjustgetthreetimesbigger;theygainnewstructures
Andoneofthemainreasonsourbraingotsobigisbecauseitgotanewpart,calledthe"frontallobe
"Andparticularly,apartcalledthe"pre-frontalcortex
"Nowwhatdoesapre-frontalcortexdoforyouthatshouldjustifytheentirearchitecturaloverhaulofthehumanskullintheblinkofevolutionarytime
Well,itturnsou