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For example, the suggestion that I would be a very happy if I were ten years younger is not falsifiable, and thus not worth thinking about.  We have no way of knowing if it is false.

For example, the suggestion that I would be a very happy if I were ten years younger is not falsifiable, and thus not worth thinking about.  We have no way of knowing if it is false.

[[Karl Popper]] persuasively argued that a theory that is not falsifiable is not scientific, because there is no possible way to disprove it.  This is known as the doctrine of falsification.

Philosopher [[Karl Popper]] persuasively argued that a theory that is not falsifiable is not scientific, because there is no possible way to disprove it.  This is known as the doctrine of falsification, which was a response to [[David Hume]]'s critique of the inductive nature of science.

==Carl Sagan==

==Carl Sagan==