
Bullseye with Jesse Thorn Mary Roach on 'Replaceable You: Adventures in Human Anatomy'
Jan 16, 2026
Mary Roach, a science writer known for her humorous investigations into unusual topics, dives into body part replacement in her latest book. She shares fascinating stories, like a Georgian surgeon using a finger for penile surgery and the quirks of historical nose replacements. Roach also explores the science behind skin grafts and hair transplants, recounting her own experience donating follicles. Plus, she delves into the ethical dilemmas of using genetically engineered pigs for organ transplants, blending humor with the grisly realities of medical advancements.
AI Snips
Chapters
Books
Transcript
Episode notes
Finger Used In Phalloplasty
- Mary Roach traveled to Tbilisi to investigate a surgeon who rebuilt a penis using a middle finger and grafted skin.
- The reconstructed penis used the finger for rigidity and was demonstrated holding a ceramic pitcher to show strength.
Flap Technique Still Works
- Early nasal reconstruction used forehead or cheek skin flaps still attached at one edge to re-grow a nose in place.
- Surgeons would later free the flap once blood supply and healing established to complete the new nose.
Menagerie Of Temporary Skin Covers
- Mary Roach recounts many materials used as temporary skin covers, from frog and pig skin to cod skin and cadaver skin.
- She notes cadaver skin remains common while companies try to grow full-thickness skin in labs.









