BBC地平线：我们身处哪个宇宙

Imagineaworldwheredinosaursstillwalktheearth.AworldwheretheGermanswonWorldWarIIandyouarepresidentoftheUnitedStates.Imagineaworldwherethelawsofphysicsnolongerapplyandwhereinfinitecopiesofyouareplayingouteverystorylineofyourlife. 　　ItsoundslikeaplotstolenstraightfromHollywood,butfarfromit.Thisisthemultiverse. 　　Untilv...