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Mary Roach: You’re More Replaceable Than You Know

Sep 15, 2025
Mary Roach, a renowned science writer and author of "Replaceable You: Adventures in Human Anatomy," discusses the fascinating and often quirky world of body replacement. She explores innovative advancements like prosthetics, printable organs, and gene-edited pig kidneys. Roach shares intriguing stories from history, including the peculiar practice of brides choosing dentures over natural teeth. The podcast delves into the emotional complexities of bodily replacements and the ethical implications of cutting-edge technologies like xenotransplantation and CRISPR.
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ANECDOTE

Grotesque Early Dentures

  • Early dentures were often grotesque and uncomfortable, using springs and even gum piercings.
  • Mary Roach describes George Washington's stiff look as partly caused by failing denture technology.
ANECDOTE

Matrimonial Dentistry Fad

  • Mid-20th-century people sometimes chose to pull healthy teeth to get dentures for cosmetic or social reasons.
  • Roach recounts stories and interviews showing it was a cultural fad despite poor function.
INSIGHT

Complexity Makes Perfect Replacements Elusive

  • Replacing body parts often fails to match the original due to complex structures and interactions.
  • Mary Roach uses tear film as an example of deceptively intricate biology resisting simple replacement.
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