Somewhere Hume says it is conceivable that at least one thing can come into being without a cause, and he illustrates this claim, I believe, with the example of a rabbit that at one moment is not imagined to be somewhere (i.e., at whatever location one is imagining) and at the next moment is in full view. Hume thinks this illustrates the possible event of a thing coming to be without a cause. But it seems to me that it might equally be an example of creatio ex nihilo.
Integral to Dembski's idea of specified complexity (SC) is the notion that something extrinsic to evolution is the source of the specification in how it develops. He compares SC to the message sent by space aliens in the movie "Contact." In that movie, earthbound scientists determine that radio waves originating in from somewhere in our galaxy are actually a signal being sent by space aliens. The scientists determine that these waves are a signal is the fact that they indicate prime numbers in a way that a random occurrence would not. What is interesting to me is the fact that Dembski relies upon an analogy with a sign rather than a machine. Like a machine, signs are produced by an intelligent being for the sake of something beyond themselves. Machines, if you will, have a meaning. Signs, if you will, produce knowledge. But the meaning/knowledge is in both cases something other than the machine/sign itself. Both signs and machines are purposeful or teleological...
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