Cave man 1: Is there a tiger near our cave? Cave man 2 (having a little fun at the expense of his dim friend): There both is and is not a tiger near our cave. Cave man 1: OK.
Cave man 1 didn't live long enough to reproduce.
-- Luke -- This is basic logic. Miles is talking about big conceptual systems (I think), which cannot exist without basic logic. You can easily have an "irrational" conceptual system that is based on logic. In fact, all of them are.
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