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Here’s a freaky thought: Mitochondria. Think about that shit. It’s got its own DNA. It’s like a completely separate bunch of organisms living inside all your cells. Way back in the pre-cambrian, some single-celled ancestor of ours swallowed some other single-celled thing, and was like, “I’m keeping it as a pet!” And now we have this little bacteria-type thingie living inside each of our cells. Say hi to your cells’ pet: ...