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How Do We Make Decisions?

How do we make decisions? How are we 'sure' we've come to the right choice? And why can't 'undecided voters' make up their mind the day before an election? According to Sam Wang of Princeton University, it turns out we don't always gather the best information before we make a decision, and sometimes your brain has decided before your mind knows it.

Credit: National Science Foundation and Discover magazine

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Related story: Unlocking the Secrets and Powers of the Brain