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The cover of Replaceable You

Replaceable You

Mary Roach, 2025

A witty, reported tour of how medicine replaces body parts, from pig organs and printed tissue to ivory hips and iron lungs, and why originals stay hard to match.

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6 parts, about 20 minutes to read.

Why read it

  • Visits surgeons, labs and patients to show why artificial replacements for teeth, skin, hips and organs rarely match the originals
  • Follows the hard problems of transplants, from immune rejection to gene edited pig organs and human cells grown inside pig embryos
  • Shows that simple, cheap designs, such as ivory hips and manual cataract surgery, can sometimes beat sophisticated technology

Who it is for

  • Readers curious how surgeons and bioengineers rebuild the body
  • People facing a transplant, amputation or joint replacement
  • Readers who like medical history and lab visits

What the summary covers

  1. Replacement Is Not Equivalence3 min
  2. Living Parts Push Back3 min
  3. Function Depends On The Person3 min
  4. Simple Can Beat Sophisticated5 min
  5. Manufacturing Life Is The Hard Part4 min
  6. The Body Remains The Standard2 min

Recommended by

  • Brianne KaneBooks and culture lead at Scientific American
    Roach has knocked it out of the park again.

About the author

  • Mary RoachAmerican author specializing in popular science and humor
    • Author of eight New York Times bestsellers, including Stiff, Gulp, Fuzz and Packing for Mars.
    • Her books have been published in 21 languages, and her second book, Spook, was a New York Times Notable Book.
    • Has written for National Geographic, Wired and The New York Times Magazine, among others.
    • Was a guest editor of the Best American Science and Nature Writing series and an Osher Fellow with the San Francisco Exploratorium.
    • A finalist for the Royal Society's Winton Prize.
    • Graduated from Wesleyan University in 1981 with a bachelor's degree in psychology.
    • Her writing career began in the public affairs office of the San Francisco Zoological Society, producing press releases on topics such as wart surgery on elephants.
    • Has no formal science training; she says science stories were always the most interesting ones she was assigned to cover.

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