Matt: For the record: I have a bias. Had I continued down the path of biochemistry, I undoubtedly would have fallen into mycology. I was always interested in soil ecology as well as the interplay between bacteria, fungus, and the human body.-Very farsighted. Science is just now studying how much of our bodies is made up of someone or somethings, other than basic us. Consider fecal transplants to cure or ameliorate gut troubles, as one simple example.