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Saint Valentine's Day, commonly known as Valentine's Day, or the Feast of Saint Valentine, is observed on February 14 each year.

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Your Brain in Love and Lust - by Scientific American  

SUBSCRIBE to our channel: http://goo.gl/aLpxX __ Scientific American traces the flow of chemicals in the brain during different phases of romance and describes surprising insights from the science of attraction. -- For our latest videos visit the Scientific American video page http://scientificamerican.com/video.cfm or subscribe via RSS http://rss.sciam.com/sciam/global-videos

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