The other night, I watched a new Mike Rowe special called "Dirty Mike Rowe". Its about microbes and parasites that exist on the human body. I think its pretty good, but then I'm a fan. There is an endoscope involved - you have been warned.
Tonight, I was watching Ze Frank's Ted talk. When it was over, I noticed a link to Mike Rowe's Ted talk. I hadn't seen it before, and like I said, I'm a fan. So I watched it. Starting at 15:08, he talks about an issue that has been bothering me more and more over time.