Bacteria mineralized the rocks; they deposited the iron. They made the geology we see.

You can find bacteria everywhere. They're invisible to us. I've never seen a bacterium, except under a microscope. They're so small, we don't see them, but they are everywhere.

My bacteria glow in the dark - no human being doesn't like that.

You live in intimate association with bacteria, and you couldn't survive without them.

We mostly don't get sick. Most often, bacteria are keeping us well.

Think about multicellularity on this Earth. Every living thing originally came from bacteria. So, who do you think made up the rules for how to perform collective behaviors? It had to be the bacteria.