If we don't have visual cues to guide us, people tend to walk in circles. Many theories have been put forth for why this is so, but experiments that control for variables such as right-handedness, brain-side dominance, and more strength on one side come up with the same results: we tend to go in circles. Read more about it at NPR. http://www.npr.org/blogs/krulwich/2010/11/03/131050832/a-mystery-why-can-t-we-walk-straight -via Metafilter
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