A: Hi, I'm reading a really interesting article about the human body.
B: Yes? Well, we all know that from biology lessons.
A: No, we didn't learn much at school! They discover a lot of new things all the time. Really awesome stuff! Did you know that only about one-tenth of your body's cells are actually you? The rest are bacteria.
B: What? I'm not really me?
A: No, of course it's you, but you also have millions or trillions of bacteria in you.
B; uuught
A: No, mostly they are really useful. Someone conducted an experiment to find out if animals can live without bacteria, and he found that many of them died or were forced to adhere to a special diet. You see, animals need bacteria to digest their food. So we're better off with the bacteria.
B: Unless the bacteria is bad.
A: Unless they are bad, but almost all are good. Oh, and going back to the cells, do you know how many cells are in your body?
B: I would say quite a lot. A few good ones.
A: Yes, but how much?
B: I don't know. I'm not a mathematician.
A: 7 octillion! That's 7 plus 27 zeros.
B: I knew it was a lot.
A: Okay, this is an incredibly huge number that is almost impossible to imagine. But the really strange thing is that most of the atoms are empty space, just air or nothing. And if you take away the empty space, you can put your body in a tiny cube measuring about 500 centimeters on each side. This is a box measuring 0.002 centimeters on each side. You'd be too small to see.
B: Mmm, I can imagine that. It's like something that could happen in a really bad Hollywood movie. You know, the mad scientist says: (in a funny voice) I'm going to remove all the air from your body. All right, enough facts for one day.
A: Don't go away! And one last thing, do you know.
B: No. A: Did you know that you probably have ticks on your eyelashes?
Q: Ticks on my eyelashes? In any case, what are ticks?
A: Yes, they are very small creatures, like insects, but not insects. Their length is about a third of a millimeter, so you can't see them. These special mites live in the eyelashes and eyebrows.
B: And in mine?
A: Well, maybe not. Only 50% of people have them, and even more people are older, so you may not have them. In any case, they are completely harmless, they just eat dead skin.
B: Yes, that's right, harmless. I really would rather not know about it.
A: Sorry. B, I mean, really!
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