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 Children Learn How Children Learn How Children Learn is a nonfiction book by educator John Caldwell Holt, first published in 1967. A revised edition was released in 1983, with new chapters and commentaries. The book focuses on Holt's interactions with young children and his observations of children learning. From them, he attempts to make sense of how and why children do the things they do. The central thesis of his work is that children learn most effectively by their own motivation and on their own terms. He opposes teaching in general, believing that children find it just as patronizing as would an