If a coin comes down heads, that means that the possibility of its coming down tails has collapsed. Until that moment the two possibilities were equal. But on another world, it does come down tails. And when that happens, the two worlds split apart.
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About Philip Pullman
Philip Pullman was a contemporary English author. Sir Philip Nicholas Outram Pullman is an English writer. He is best known for the fantasy trilogy His Dark Materials. Read more on Wikipedia →