Humans and bacteria have a common ancestor. In that sense, every day is a family reunion in which my distant relatives are sipping amino acid cocktails by the pool and catching up all over my skin. I’ll let out a hearty sneeze and exclaim, “So good to see you 1.8-trillionth cousin, Lactobacillus casei! Whatchoo been up to, Aunt 213 billion times removed, Enterococcus faecium?”