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