“When we apply the principles of quantum physics to the entire universe, as Wheeler and Zeilinger advocate, the whole of nature exists in a quantum superposition state consisting of an infinite array of possibilities. According to Hawking, every possible version of a single universe exists simultaneously in that quantum superposition. When you choose to make a measurement, you select from this range of possibilities a subset of histories that share the specific features measured. The history of the universe as you conceive of it is derived from that subset of histories. In other words, you choose your past.”
                                                                                                                                                                                                                       Alan Wallace (Mind in the Balance)