In "Grunt: The Curious Science of Humans at War," Mary Roach explores the intriguing world of military science, delving into various aspects of how humans cope with the challenges of warfare. One of the many fascinating facts she uncovers is about maggots, which possess a unique respiratory system. Rather than breathing through their mouths, these creatures utilize their rear ends for respiration, showcasing the diversity of adaptations in the animal kingdom.

Roach's writing style blends humor with scientific inquiry, making complex topics accessible and engaging for readers. By examining the often-overlooked details of life and death in the military context, she sheds light on the unexpected interactions between human beings and other organisms like maggots, prompting readers to rethink their perceptions of both war and nature.