How the Snake Lost Its Legs the butterfly, the snake, and the cheetah. Each consists of three to eight sections named in the style of Rudyard Kipling's "Just So Stories", with titles like "How the butterfly got its spots" or "How the snake elongated its body", though a couple of sections use "Why?" rather than "How?", as in "Why the fly twirls his penis" (it rotates during embryonic development under the control of different genes). In these chapters, Held explains the mechanics of evolutionary developmental biology, complete with accounts of what genes such as hox, hedgehog, and engrailed do to shape bodies. The third part is
Who We Are and How We Got Here Reich "seems a contradiction: Rising to the pinnacle of human genetics, he nonetheless exhibits incredible naiveté" in affairs such as when German scientists withdrew from a paper that seemed to them "uncomfortably close to pre-Nazi racial theories", or when Native American specimen donors wished to limit the use of their DNA. Hawks argues that science needs to help people to see the humanity of the dead ancestors, and finds Reich's approach potentially dehumanizing. Who We Are and How We Got Here Who We Are and How We Got Here is a 2018 book on the contribution of genome-wide ancient DNA