Radiolab did a show on this recently and it was interesting to say the least.<p>Podcast here:
<a href="http:&#x2F;&#x2F;www.radiolab.org&#x2F;story&#x2F;best-medicine&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.radiolab.org&#x2F;story&#x2F;best-medicine&#x2F;</a>