Not sure why this is even news. It has been known for a long time. Yahoo just woke up and figured this out?
There is a great book talking about gut flora and other cases of co-evolution of the human body and other microbes. It is a fantastic read, called "The wild life of our bodies" by Rob Dunn.
I was wondering the same thing. It's definitely not "news", it just isn't publicly talked about all the much I guess. I've learned a lot this semester about microbes and bacteria and it's crazy what they can do - good and bad.
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