Hank describes some of the best explanations that neurologists have come up with to account for the strange sensation we know as déjà vu.
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References
http://www.scientificamerican.com/article.cfm?id=what-is-going-on-in-the-brain
http://www.scientificamerican.com/article.cfm?id=deja-vu-found-originate-similar-scenes
http://science.howstuffworks.com/science-vs-myth/extrasensory-perceptions/question657.htm
