I weigh about 80 kilograms. Most of that, let’s say 64 percent, is water-- though you can’t tell by looking.
I mean, as organisms go, I like to think that I look fairly solid. After water, the next largest proportion of me is protein, about 16% -- not just in my muscles, but also in things like the tiny sodium-potassium pumps in my neurons, and the hemoglobin in my blood, and the enzymes driving the chemical reactions in every one of my 37 trillion cells.
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