Microscopic friends.

This is not for the week of stomach.
You live with millions of little friends all the time. The fact of the matter is, of all that you are, you are made up of more little friends than anything else. I'm not just talking about the eyelash mites we all carry either. We live with other mites too. Dust mites live in our beds. Typically about 3,000,000 in the average bed. They feed off our dead skin cells. It's like a rain of Manna from the sky. There's nothing you can do about it so I hope I don't send anyone to the psychologist with this.
Our skin is covered with bacteria and microbes. About ten times as many bacteria as skin cells. Don't worry though, they mostly harmless. The worst of them only cause acne. Not such a big deal really. Occasionally some folks get worse issues like the infamous "flesh eating" bacteria. It really does exist, but it's extremely rare.
We carry a lot of little friends inside us too. We would be dead without these little friends. We all know that our stomach is a pit of acid that dissolves our food, but did you know there's a host little friends in there too called "Gut Flora" that are actually little animals helping us digest our food. These little guys are not supermen either. An overdose of antibiotics can kill them. If this happens, you have to get an infusion of new flora from someone else. This infusion is too gross in concept for me to even mention, so I'll just say this, don't take antibiotics without a prescription!
We take in more of these little friends all the time. Yogurt is a bacteria and often contains a live culture. I don't really like the idea behind yogurt, so I don't eat it very often. Cottage cheese, raw milk and even vegetables all carry little friends. My favorite is yeast. Did you know that yeast eats sugar? It does! And when it does it pees out alcohol! That's right folks, alcohol is the urine excreted from yeast! Doesn't that make you want to sit down with a nice cold beer or glass of wine? It doesn't stop there, they also fart out carbon dioxide. That's what makes your bread rise.
Don't you just love our little friends?