I already knew this intuitively, although my mom still finds it freakish that I can smell her making Kool-aid from the opposite end of the house on a different floor.
http://www.theglobeandmail.com/servlet/story/LAC.20061218.SMELL18/TPStory/National
http://www.theglobeandmail.com/servlet/story/LAC.20061218.SMELL18/TPStory/National