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"Oceans have salt water in them. Pools typically have chemicals, like chlorine, in them."

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"I don't like salt. I don't know about chlorine."

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"Ocean's out, then. I suspect chlorine will be, too, but if you like we can check."

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"At a pool or some other way?"

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"It can be at a pool, or we can try to find a pool care store and see how you feel about it in raw chemical form."

She probably won't like chlorine, but Lynn is not going to stop her daughter from checking.
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"A pool care store? You have to care for pools? Like they're hamsters?"

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"Sort of," laughs Lynn. "If you don't put chemicals into pools they can get very icky. Especially a public pool."

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"Icky how?"

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"Algae and bacteria mostly, I think. But there are other issues of hygiene involving a public pool that necessitates more of the chemicals. Some people think it's a good idea to pee in them."

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"What about this pond?" wonders Astrid.

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"This pond has a more balanced ecosystem. Things to eat the algae, and such, so it doesn't get icky. Or did you mean people peeing in the pond?"

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"That. Do people do that?"

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"Probably. Right behind 'I don't know what this is so I'm going to try eating it' is, 'No one can see me so I'm going to pee in it.' Thankfully it's so diluted and cleaned up by the aforementioned ecosystem that it's really not going to be a problem."

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"Are there fishes in the pond doing fish things?" wonders Astrid next.

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"I think so. Little ones. The water's a bit murky, though, it's hard to spot them."

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"What's the murk?"

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"Mud, the algae and bacteria I mentioned, some other things. Probably some plants that have fallen in and started being broken down."

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"Why do they break?"

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"Entropy. They don't get enough of what they need to survive, something breaks a twig off from the rest of the branch, or the plant sheds things on its own. Or time, most things break if given long enough."

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"What's entropy?"

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"It's the - gradual decline into disorder. Or chaos. A system left alone for long enough, biological or political tends to break down into chaos."

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"Why?"

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"That is a... Complicated answer. I think the easiest way to explain it is that - things are not perfectly efficient, so the systems they make, when given long enough, eventually break down due to lack of resources, whether it's the more basic needs of energy and matter, or the more complex resources of creativity and drive."

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"I don't get it."

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"Things - run out of energy to do things," Lynn tries.

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