The essence of quantum physics is unpredictability. At every instant, the objects in our physical environment — the atoms in our lungs and the light in our eyes — are making unpredictable choices, deciding what to do next. According to Everett and Deutsch, the multiverse contains a universe for every combination of choices. There are so many universes that every possible sequence of choices occurs in at least one of them. Each universe is constantly splitting into many alternative universes, and the alternatives are recombining when they arrive at the same final state by different routes. The multiverse is a huge network of possible histories diverging and reconverging as time goes on. The “quantum weirdness” that we observe in the behavior of atoms, the “spooky action at a distance” that Einstein famously disliked, is the result of universes recombining in unexpected ways.He is right. The multiverse is not science, as I have explained.
According to Deutsch, each of us exists in the multiverse as a crowd of almost identical creatures, traveling together through time along closely related histories, splitting and recombining constantly like the atoms of which we are composed. ...
Opinions vary widely concerning the proper limits of science. For me, the multiverse is philosophy and not science. Science is about facts that can be tested and mysteries that can be explored, and I see no way of testing hypotheses of the multiverse. Philosophy is about ideas that can be imagined and stories that can be told.
Not sure what he means by "unpredictability". I argued below that probability is not the essence of quantum physics, and I got some criticisms in the comments. You can read the exchange, and make up your own mind.
Dyson ends by trashing modern philosophy:
When and why did philosophy lose its bite? How did it become a toothless relic of past glories? ... As a result, science grew to a dominant position in public life, and philosophy shrank. Philosophy shrank even further when it became detached from religion and from literature. ...Philosophers of science get science badly wrong, as I explain in my book. Other physicists have opposed philosophy. They will continue to have no respect for philosophy as long as all the philosophers deny that physicists are seeking truth and making progress.Cuisinart Smart Stick Stainless Steel Hand Blender & Chopper (Google Affiliate Ad)