Humans aren't Human

"Of the trillions and trillions of cells in a typical human body \ at least 10 times as many cells in a single individual as there are stars in the Milky Way \ only about 1 in 10 is human. The other 90 percent are microbial. These microbes \ a term that encompasses all forms of microscopic organisms, including bacteria, fungi, protozoa and a form of life called archaea \ exist everywhere. They are found in the ears, nose, mouth, vagina, anus, as well as every inch of skin, especially the armpits, the groin and between the toes. The vast majority are in the gut, which harbors 10 trillion to 100 trillion of them.
In the womb, humans are free of microbes."
Forget where I ran across this, but it impressed me.