
Ep 105: David Deutsch’s “The Fabric of Reality” Chapter 4 “Criteria for Reality” Part 1
ToKCast
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We Don't Know if Unicorns Exist
He says we should conclude that a thing is real if it figures in our best explanation of something. If among our best explanations of the world, unicorns appear nowhere, then there is no reason to conclude they are real, that they exist. Now does this rule out unicorns being found in the future? Of course not. We haven't ruled out their possibility of existing. We are merely saying that we cannot conclude they exist. Our best theories of life seem to predict that it will arise if and where it can - but those same s do not allow us to predict what particular species will arise for example.
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