"Aún no sabemos si los universos paralelos existen": Christophe Galfard, el discípulo de Stephen Hawking, les responde a nuestros lectores You have got already finished the quiz just before. That's why you may not get started it again. Quiz is loading... You have to register or join to start the https://www.youtube.com/watch?v=5LF34uf-LC4