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ž Peek into a clean room with no one in it. There are no pets in the room. There are no plants in the room. It looks like there is nothing alive in the room. The room, however, is swarming with life. Billions of tiny life forms called bacteria cover the tables and chairs and the floor. You can’t see them, but they stick to the windows, they cling to the ceiling, and they float through the air.
Suppose you looked at part of a chair in the room through a microscope. Microscopes magnify bacteria. You would see pale forms moving and bumping into each other like ghosts. These tiny life forms are bacteria. They live everywhere in the world. Billions of them even live inside of you!
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