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Human beings can't see anything without wanting to destroy it, Lyra. Somewhere out there is the origin of all the Dust, all the death, the sin, the misery, the destructiveness in the world. If light can cross the barrier between the universes, if Dust can, if we can see that city, then we can build a bridge and cross. You saw Dust pouring into this world from the Aurora. You saw those slides I showed the Scholars in the retiring room. "And I'm going to that world beyond the Aurora," he said, "because I think that's where all the Dust in this universe comes from. Except that other worlds have sprung into being, on which they did happen. In fact, these possibility collapses happen at the level of elementary particles, but they happen in just the same way: one moment several things are possible, the next moment only one happens, and the rest don't exist. I'm using the example of tossing a coin to make it clearer. And when that happens, the two worlds split apart. "But on another world, it does come down tails. Until that moment the two possibilities were equal. If it comes down heads, that means that the possibility of its coming down tails has collapsed. Take the example of tossing a coin: it can come down heads or tails, and we don't know before it lands which way it's going to fall. "Now that world, and every other universe, came about as a result of possibility. And we had to learn to see it, Lyra, just as you learned to use the alethiometer.
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Well, we were wrong we learned to see the world up there.
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That would violate fundamental laws, we thought. "But no one thought it would ever be possible to cross from one universe to another. However, it's true there's no possible way of denying it. The witches have known about them for centuries, but the first theologians to prove their existence mathematically were excommunicated fifty or more years ago. "One of uncountable billions of parallel worlds.
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