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
How Many Fucks "How Many Fucks" received positive reviews from music critics, with some complimenting its "sexy" appeal. A music video was released the same day of the single release, and featured Jayne in several "risqué" outfits. "How Many Fucks" was written by Justin Tranter and Myah Marie, while its production was handled by Adam "Gage" Bruce. As described by Jennifer Pearson of "Daily Mail" stated that the single would likely "lift her from relative obscurity" and joked that the lyrics "drop[ped] the F-bomb several times to answer that question," referring to the song's title. Musically, "How Many Fucks" is a pop rap