How the Snake Lost Its Legs fly embryo. His books on evolutionary developmental biology (evo-devo) include "Imaginal Discs: The Genetic and Cellular Logic of Pattern Formation" (2002), "Quirks of Human Anatomy: An Evo-Devo Look at the Human Body" (2009), and "Deep Homology? Uncanny Similarities of Humans and Flies Uncovered by Evo-Devo" (2017). In Held's view, "Quirks", "Snake", and "Deep Homology" form a trilogy on evo-devo. "How the Snake Lost Its Legs" is ostensibly organised into six chapters, but in effect into three parts. The first chapter serves as an introduction and overview. The next four chapters provide what Held calls "the meatier aspects of evo-devo" with
Butterfly sword Chun schools measure to the outside of the bicep. Butterfly swords are regarded by many Chinese martial artists to hold the most versatility and balance of offensive and defensive capabilities of any Chinese weapon, with many more capabilities than just a weapon. Butterfly sword The butterfly sword () is a short dao, or single-edged sword, originally from southern China, though it has also seen use in the north. The blade of a butterfly sword is roughly as long as a human forearm, which allows easy concealment inside loose sleeves or boots, and allows greater maneuverability when spinning and rotating during