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Freakonomics Radio

The Vanishing Mr. Feynman (Update)

May 29, 2026 • 1h 0m

Summary

⏱️ 13 min read

Overview

This final episode of the Freakonomics Radio series on Richard Feynman explores the physicist's later years, including his experiments with psychedelics at Esalen, his relationship with three women who became his guides into altered consciousness, and his lifelong quest to visit the remote land of Tanutuva. The episode examines Feynman's legacy as a science communicator, his impact on public trust in science, and his fundamental philosophy of curiosity and intellectual honesty.

The Esalen Institute and Feynman's Exploration of Consciousness

Richard Feynman, the theoretical physicist and rationalist, spent time at California's Esalen Institute in the 1970s and 80s, exploring the boundaries of consciousness. As a 'hippie sympathizer,' Feynman approached these experiences with scientific curiosity, investigating mysticism, isolation tanks, and hallucinations. At Esalen, he gave lectures while remaining skeptical of pseudoscience, always careful not to fool himself while pushing the edges of understanding.

  • Feynman frequented Esalen Institute, the epicenter of the human potential movement, in the 1970s and 80s
  • Ralph Layton describes him as a 'hippie sympathizer' who walked barefoot to keep his feet 'street worthy'
  • Feynman investigated mysticism and mystic experiences, including isolation tanks that produced hallucinations
  • He was fascinated by boundaries - between land and water, consciousness and unconsciousness, understanding and not understanding
" Boundaries between land and water, the boundary between consciousness and unconsciousness, the boundary between understanding something and not quite understanding something. And I think he knew that you find out the most interesting things when you're poking around the edges. "

The Three Graces: Feynman's Psychedelic Experiences

In the early 1980s at Esalen, Feynman met three women - Debbie Harlow, Cheryl Haley, and Barbara Berg - who became his guides into psychedelic experiences. Despite his lifelong reluctance to tamper with his precious mind, Feynman agreed to try psilocybin mushrooms and LSD, motivated by his cancer diagnosis and finite time remaining. These experiences explored the nature of consciousness and reality, with Feynman approaching them with characteristic scientific curiosity.

  • Feynman met three women at Esalen who had been experimenting with psychedelic drugs for therapeutic purposes
  • He had never done drugs before because his mind was 'so precious to him,' but agreed after his cancer surgeries
  • During his first LSD experience, Feynman kept saying 'we've got to draw the line somewhere' while watching water move
  • In one session, he stared at a banana for three hours on the couch, occasionally turning it
  • Feynman gave the three women carte blanche permission to reveal his psychedelic experiences
" He had never done any drugs prior to that time because his mind was so precious to him and he didn't want to do anything to tamper with it. And so he did confide to me that the reason he was willing to do it at this time was because he had already had surgery for cancer. "
" What a physicist does is explore the nature of reality. and I think he was equally curious about his own nature of reality. And so anything that he could learn or experience that was new was welcome to him. "

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