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Many Worlds interpretation is crap
The universe, to the best of our scientific knowledge, is non-deterministic. This pisses a lot of scientists off.
The field of quantum mechanics studies many situations where particles seem to behave as if they were in two places at once, or (equivalently but a lot more weirdly) where the same event happens at two different times. Scientists can infer this behavior by observing effects like interference patterns , but they never actually detect the particle in both places: whenever they try to observe the particle, they only ever detect it in one place. And here's the kicker: which of the two places the particle is observed is indeterminate, there's no way to predict it. All you can do is make statistical observations (such as: it'll zig 40% of the time, and zag 60% of the time ).
Erwin Schrödinger tried to explain this paradox as "wave function collapse". What he suggested was that the particle is in both places at once, but when the particle is "observed" (meaning: when it directly interacts with another particle) its existence collapses into a single location. The wave function is a probability of which location it will collapse to.
However, most scientists (Schrödinger included, who gave us a tongue-in-cheek large scale consequence of that explanation) don't like not being able to predict things. Albert Einstein was perturbed by this explanation; he once said "God does not play dice with the universe".
In the years since Einstein and Schrödinger's heyday, another explanation has come into fairly wide acceptance, one that eliminates the indeterminacy (and, thus, the scientists' own sense of inadequacy). What they claim is that, yes, the particle does exist in two places at once, but when the particle is observed, the wave function doesn't collapse. Instead, the universe splits: and in one universe, the particle is observed in one location; in the other universe, the other location. This supposedly happens every single time a particle with multiple quantum states interacts. This is known as the Many Worlds interprtation.
I'll cut to the chase. Scientists should run away screaming from this explanation because what they've done is asserted the existence of universes where where God demonstratably exists, which is a no-no for any respectable scientist .
You see, although quantum effects are small, they do have large scale consequences. If all quantum possibilities are realized, then there is a universe somewhere where all the particles zag in such a way that their cumulative effect results in demonstratable benefits to people who pray to a certain god, and scientists in that universe measuring this effect will have to conclude that that god exists.
Not only that, but there are universes like that that will branch off this one. If Many Worlds is true, then there is a universe branching from this one where scientists will wake up to discover that a plague has appeared that attacks everyone but Christian fundamentalists. Richard Dawkins, Steven Jay Gould, and Carl Sagan will have to eat their crow in that universe. (I realize that last two have died, but they aren't dead in that universe. Although the universe we're talking about did branch off this one, various quantum effects combined in such as way so as to restore life to their bodies, and they rose from the grave, just in time to see a plague attack everyone but Christian Fundamentalists.) They can at least take solace in the fact that there's another universe out there with a plague that attacks only Christian Fundamentalists.
According to Many Worlds, universes have been branching off in the past. So it might comfort you to know that in some world out there you did ask that girl to the prom, but it probably wouldn't comfort you to know that in some other universe out there you were hit by a car and spent your whole life living as a quadriplegic.
It's also likely, accoring to Many Worlds, that you're immortal. Many theories on aging put at least part of the blame on the gradual chemical breakdown of molecules in the body. If all quantum possibilities are realized, then in some universe those chemical breakdowns will not occur, and you'd live forever, or at least until the world ends. Which sounds nice, perhaps, but that forever could be in a dungeon.
Enough silliness. I believe Many Worlds is crap, for various reasons, including some which are personal to me and can't rationally be demonstrated to others. But the Many Worlds interpretation should be rejected by science as well.
The fact is, Many Worlds is not a scientific theory or hypothesis, because it can be neither verified nor falsified (apart from falsifying quantum mechanics altogether). Whether the Many Worlds interpretation, or some other interpretation, such as the Copenhagen interpretation that Schrödinger wrote of, is "correct", has no bearing on science. Either interpretation results in the same observable predictions. Whether the wave function collapsed, or you are observing from Universe A, you are going to observe the same result.
The simple truth is, Many Worlds is a philosophical statement and not a scientific one. And philosophically it is the interpretation most opposed to science, because it asserts the existence of worlds where science is worthless. That is far, far worse than an interpretation that allows for mere indeterminacy.
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