简介：Imagineaworldwheredinosaursstillwalktheearth.AworldwheretheGermanswonWorldWarIIandyouarepresidentoftheUnitedStates.Imagineaworldwherethelawsofphysicsnolongerapplyandwhereinfinitecopiesofyouareplayingouteverystorylineofyourlife.　　ItsoundslikeaplotstolenstraightfromHollywood,butfarfromit.Thisisthemultiverse.　　Untilveryrecentlythewholeideaofthemultiversewasdismissedasafantasy,butnowthisstrangestofideasisatthecuttingedgeofscience.　　Andforagrowingnumberofscientists,themultiverseistheonlywaywewillevertrulymakesenseoftheworldwearein.　　Horizonasksthequestion:Domultipleuniversesexist?Andifso,whichoneareweactuallyin?…