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Sources:
http://www.scientificamerican.com/article/thinking-hard-calories/
http://io9.com/5920970/how-many-calories-does-thinking-burn
http://www.popsci.com/scitech/article/2006-07/mental-workout
http://www.nytimes.com/2008/09/02/science/02qna.html?_r=0