Yum, yum. These guys—the good-guy bacteria—wait in your intestines for food
to come from your stomach. Then they take something you recognize as
food (in this case, lettuce) and break it down into something your body
recognizes as nutrients (which look nothing at all like lettuce).
Not all bacteria inside you are good. Some are harmful, like the bacteria below
that attack your teeth and cause plaque buildup and cavities. (RAD! There's
actually a reason to brush your teeth!)
Sometimes good-guy bacteria kill off bad-guy bacteria. But sometimes good-guy
bacteria get help from other infection fighters. If you want to see what they
look like (it's kinda bloody), click here. If you're squeamish about
that kind of stuff, click here to read an interview with Lennart Nilsson
and find out how in the heck he took these photographs. If you want to find out
how many bacteria (both good and bad) live inside you, click here.
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