"So the idea that there is nothing essential, in the sense that there are no human universals, is dogma. Ask most anyone who is going to be shot at dawn."

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There are a lot of differing opinions on that. Some people think you should change out more, but I think changing just 20 percent is less stressful on the aquarium and fish. Once you get used to the regimen, it's pretty easy.

— Brian K. Vaughan