http://www.youtube.com/v/NddZ5ftQb0Q?list=TLJLaFPgJSH1wyOLAjYw6L61lKMYt_OCcX&version=3&showinfo=1&attribution_tag=_9YdzrUhWQXLQl3V3xwcjg&autoplay=1&autohide=1&feature=share
What is found in everyone's stomach? Is this a chemical or physical reaction?
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