Then I come across this story: Belly Button Bacteria: Biologists Seek Reason For Navel Flora Differences:
The idea was simple. We would culture the bacteria of people’s belly buttons to provide folks with a visual measure of the life on them, a reminder of the mysteries everywhere. Then we noticed something more serious... peoples’ belly buttons differed in terms of which species live in them. They differed more than we expected. We were intrigued and so we decided to get a little more serious about our study.
HOLY SHIT! There's a party going on right in front of me, and no one sent me an invitation. Check this out:
This is huge. I mean, who needs kids when EVERY ONE OF US is nurturing this kind of life?! I need more information. What should I feed my bacteria? Do they need daily baths? Do they like wine? Ah well. They must.