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
How the States Got Their Shapes How the States Got Their Shapes How the States Got Their Shapes is a US television series that aired on the History Channel. It is hosted by Brian Unger and is based on Mark Stein's book, "How the States Got Their Shapes". The show deals with how the various states of the United States established their borders but also delves into other aspects of U.S. history, including failed states, proposed new states, and the local culture and character of various US states. It thus tackles the "shapes" of the states in a metaphorical sense as well as a literal sense.