Little child, little child
Little child won't you dance with me
I'm so sad and lonely
Baby take a chance with me
Sometimes, you DO get another chance
Being single doesn't bother you so much, but on nights like this you miss That Thing. The guy who would say, 'To hell with your job, you're too good for that stuff.' And, 'Hey, asshole, leave my girlfriend alone.' And, 'Go to bed. I'll get you a glass of water.' Yeah, that stuff. Miss that.Yeah, that says it all.

Excavated from the rubble of Sept. 11 could have been, and should have been, a crucial and instructive lesson beyond the expected hand-wringing over security and preparedness. Specifically, a call for American citizens to broaden their horizons and develop a smarter sense of the world's mechanisms and conflicts. Instead, we appear to be growing even more insular, myopic, and unimpressed with the fact that large numbers of people despise us for reasons a tad more complex than "they hate freedom." It's a path we follow at our own peril, and it is exactly opposite to what global tensions mandate. We can't tell the difference between an Indian, a Tibetan, and an Islamic radical. More to the point, we don't seem interested in learning what those differences are.
"In classical physics, [Deutch] says, there is no such thing as 'if'; the future is determined absolutely by the past."And this is still true in a multiverse model, as long as the individual universes remain independent of one another.
You can see the shadow of other universes using little more than a light source and two metal plates. This is the famous double-slit experiment, the touchstone of quantum weirdness.But we can also see things in everyday life that should make us stop and consider how we should understand them: as a previously unrecognized part of the individual universe we live in, or as a glimpse of a different universe. A third option might be that it's something imaginary, but that is an option that shouldn't be chosen lightly -- it's easy to use that as a catch-all category for anything that we haven't been able to understand enough to believe in -- but we need to also realize that the fact that something was imagined by someone might be enough to make it a real part of the multiverse.
Particles from the atomic realm such as photons, electrons or atoms are fired at the first plate, which has two vertical slits in it. The particles that go through hit the second plate on the far side.
Imagine the places that are hit show up black and that the places that are not hit show up white. After the experiment has been running for a while, and many particles have passed through the slits, the plate will be covered in vertical stripes alternating black and white. That is an interference pattern.
To make it, particles that passed through one slit have to interfere with particles that passed through the other slit. The pattern simply does not form if you shut one slit.
The strange thing is that the interference pattern forms even if particles come one at a time, with long periods in between. So what is affecting these single particles?
According to the many worlds interpretation, each particle interferes with another particle going through the other slit. What other particle? "Another particle in a neighbouring universe," says David Deutsch. He believes this is a case where two universes split apart briefly, within the experiment, then come back together again. "In my opinion, the argument for the many worlds was won with the double-slit experiment. It reveals interference between neighbouring universes, the root of all quantum phenomena."
Deutsch found that, almost all the time, information flows only within small pieces of the quantum calculation, and not in between those pieces. These pieces, he says, are separate universes. They feel separate and autonomous because all the information we receive through our senses has come from within one universe. As Oxford philosopher Michael Lockwood put it, "We cannot look sideways, through the multiverse, any more than we can look into the future."
Sometimes universes in Deutsch's model peel apart only locally and fleetingly, and then slap back together again. This is the cause of quantum interference, which is at the root of everything from the two-slit experiment to the basic structure of atoms.
"One day, a quantum computer will be built which does more simultaneous calculations than there are particles in the Universe," says Deutsch. "Since the Universe as we see it lacks the computational resources to do the calculations, where are they being done?" It can only be in other universes, he says. "Quantum computers share information with huge numbers of versions of themselves throughout the multiverse."
Imagine that you have a quantum PC and you set it a problem. What happens is that a huge number of versions of your PC split off from this Universe into their own separate, local universes, and work on parallel strands of the problem. A split second later, the pocket universes recombine into one, and those strands are pulled together to provide the answer that pops up on your screen. "Quantum computers are the first machines humans have ever built to exploit the multiverse directly," says Deutsch.
What would it mean for you and me to know there are inconceivably many yous and mes living out all possible histories? Surely, there is no point in making any choices for the better if all possible outcomes happen? We might as well stay in bed or commit suicide.
Deutsch does not agree. In fact, he thinks it could make real choice possible. In classical physics, he says, there is no such thing as "if"; the future is determined absolutely by the past. So there can be no free will. In the multiverse, however, there are alternatives; the quantum possibilities really happen. Free will might have a sensible definition, Deutsch thinks, because the alternatives don't have to occur within equally large slices of the multiverse. "By making good choices, doing the right thing, we thicken the stack of universes in which versions of us live reasonable lives," he says. "When you succeed, all the copies of you who made the same decision succeed too. What you do for the better increases the portion of the multiverse where good things happen."
Deutsch dismisses them all. "Some are gibberish, like the Copenhagen interpretation," he says-and the rest are just variations on the many worlds theme.Except, Deutsch is slightly off too. He should talk to the cognitive scientists who work in psychology, philosophy, and linguistics.
For example, according to the Copenhagen interpretation, the act of observing is crucial. Observation forces an atom to make up its mind, and plump for being in only one place out of all the possible places it could be. But the Copenhagen interpretation is itself open to interpretation. What constitutes an observation? For some people, this only requires a large-scale object such as a particle detector. For others it means an interaction with some kind of conscious being.
Worse still, says Deutsch, is that in this type of interpretation you have to abandon the idea of reality. Before observation, the atom doesn't have a real position. To Deutsch, the whole thing is mysticism-throwing up our hands and saying there are some things we are not allowed to ask.
It's not that you "travel a trillion light years" or that the other universes lack what is needed for life. Both of those concepts are rooted in the metaphors that are inherent in the universe we inhabit and are thus, by definition, irrelevant to the other universes.
Travel a trillion light years beyond the Andromeda galaxy, and you might find yourself in a universe where gravity is a bit stronger or electrons a bit heavier.
The vast majority of these other universes will not have the necessary fine-tuned coincidences needed for life to emerge; they are sterile and so go unseen. Only in Goldilocks universes like ours where things have fallen out just right, purely by accident, will sentient beings arise to be amazed at how ingeniously bio-friendly their universe is.
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