I’ve been reading a book about the genographic project. Did you know that humans aren’t one single organism but are actually chimeras; that is, we are part animal, part bacteria? My biologist friend told me that before and it kind of freaked me out, but all it means is that the mitochondrion in our cells has its own DNA which allows geneticists to trace maternal lineage.
The book keeps describing this mitochondrion as a “free-living bacterium.” Well, well. I think we all know what that means. This hippie bacterium, this good-time, party-loving maternal DNA was out on the town one day a billion years ago and came across some cell which it found strangely attractive and boom–here we are.