Northwest Bee Supply,
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If you would like to read the actual study, you can find it here on PLoS ONE; an interactive open-access journal for the…
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0021550
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0021550