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Why do you have a brain?

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If you didn't have a brain, you really couldn't do anything pretty much. Example: You wouldn't be able to walk, because you would forget how to walk. Why we have a brain? We have a brain so we can think, ( or walk. :-} ) If you didn't have a brain you wouldn't be able to ask this question.
Actually walking is controlled almost entirely by nerve paths in the spine, the brain is not involved except to select where we are walking to (part of thinking).
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