It may still be the case, and I guess it is, that immune traits are the most selected category, but is not at all the case, and in fact, we can prove it's not the case that behavioral traits are not selected.
I mistakenly expected this to be a somewhat shallow, generic popular science book, but it was a very thorough account of how CRISPR gene editing emerged from decades of obscure basic research into bacterial immune systems.
Biology is unpredictable, especially when the immune system is involved, and there is no guarantee that a drug that appears safe in animals will be safe in humans.
So right there at the beginning, before there was even a profession such as medicine, there is some writing with a scientific appreciation of the body and how to make it better. There's no dogma here, because they're constantly asking, try this for yourself, prove me wrong! And there is also the beginning of a professional ethic about a group of people who should hold each other to high moral and clinical standards. A few of the writings complain about quacks, who rip people off, and don't pay attention to the high standards.
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