The Michael Shermer Show

Rethinking the Discovery of DNA

January 3, 2026

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  • Francis Crick's discovery of the double helix was contingent on luck and circumstance, as he and Watson were not originally assigned to work on DNA. 
  • Crick's unique and lasting contribution was not the structure itself (which was deemed inevitable), but his subsequent creative work in exploring its profound implications for genetics and evolution. 
  • The popular narrative surrounding Rosalind Franklin and Photograph 51 is largely based on a distorted account in Watson's *The Double Helix*, obscuring the complex interpersonal dynamics and the fact that the photograph played no direct role in the final structural solution. 
  • Francis Crick's later career was heavily focused on consciousness, driven by a materialist desire to eliminate 'spookiness' and establish the neural correlates of experience, often starting with visual perception due to its experimental tractability. 
  • Crick's influence in neuroscience, particularly regarding consciousness, stemmed from his ability to set clear experimental agendas (like finding neural correlates) rather than conducting experiments himself, which contrasts sharply with the current proliferation of ungrounded consciousness theories. 
  • Unlike Francis Crick, who rationally self-censored his engagement with social issues after realizing his shortcomings outside of science, Jim Watson's later career has been marked by the public expression of offensive, deterministic views, possibly stemming from a belief in genetic determinism. 

Segments

Crick’s Early Influences and Style
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(00:04:04)
  • Key Takeaway: Francis Crick’s career trajectory was heavily influenced by chance, luck, and contingency, rather than pure inevitability.
  • Summary: The guest initially considered writing imaginary obituaries for Crick to illustrate how contingent his life was. Crick himself recognized that luck played a significant role in his career achievements. This perspective contrasts with the common view that major scientific discoveries are predetermined outcomes.
Watson and Crick’s DNA Assignment
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(00:05:22)
  • Key Takeaway: Watson and Crick were not supposed to be working on DNA; they were redirected after Linus Pauling’s incorrect proposal.
  • Summary: Both Crick and Watson were initially focused on protein research at Cambridge. Their pivot to DNA occurred only after Pauling published a structure that spurred them into action for a few intense weeks. Had Pauling succeeded, the Watson-Crick discovery might never have happened.
Inevitability vs. Creativity in Science
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(00:07:00)
  • Key Takeaway: While the double helix structure was inevitable, Crick’s subsequent analysis of its implications was a unique act of creativity.
  • Summary: James Watson confirmed that discovering the double helix structure was inevitable, believing someone else would have found it soon after. Crick’s unique contribution was thinking deeply about the structure’s implications for genetics and evolution, which was not predetermined.
Crick’s Dual Life Ambitions
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(00:09:37)
  • Key Takeaway: Crick’s lifelong ambition, established at age 31, was to understand both the nature of life and the nature of consciousness.
  • Summary: Influenced by Schrödinger’s What is Life, Crick aimed to overthrow mystical explanations in biology and mind. He sought to place these key aspects of reality onto a materialist footing. He pursued these two ambitious goals for the remainder of his scientific life.
Influence of Children’s Encyclopedia
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(00:12:30)
  • Key Takeaway: Crick credited an eight-volume children’s encyclopedia as the most important book he ever read, shaping his scientific curiosity and communication style.
  • Summary: The encyclopedia taught Crick that science is astonishing and that clear, simple explanation is an incredible communication skill. He consciously tried to mirror this accessible style in his own public writings. He kept these volumes throughout his life.
Crick’s Connection to Beat Poetry
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(00:15:15)
  • Key Takeaway: Crick developed a close friendship with beat poet Michael McClure after being captivated by McClure’s psychedelic ‘Peyote Poem’ in 1959.
  • Summary: Crick encountered the poem at City Lights bookstore, which described the effects of mescaline using the phrase ’this is the powerful knowledge.’ Crick related this feeling of sudden perception to his own scientific breakthroughs. This connection suggests a romantic curiosity alongside his rigorous scientific mind.
Discovery Through Amiable Conflict
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(00:19:32)
  • Key Takeaway: Crick’s breakthroughs relied on amicable conflict and argument with collaborators who were intellectually different from him.
  • Summary: Crick needed colleagues like Sidney Brenner who were not like him to bounce ideas off and challenge his assumptions. This process of amiable conflict was essential for developing insights, echoing modern concepts like red teaming in cognitive psychology. Feynman noted that no one is easier to fool than oneself.
Pre-1953 Biological Context
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(00:22:40)
  • Key Takeaway: The prevailing scientific hypothesis before 1953 suggested genes were made of proteins sitting on a boring DNA scaffold, as DNA seemed too simple.
  • Summary: The main problem was understanding the gene’s molecular structure, with most believing genes were proteins, despite Avery’s work suggesting DNA’s role. Proteins were known to be structurally complex, while DNA appeared repetitive. This complexity made studying proteins the initial focus.
Franklin/Wilkins Conflict Setup
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(00:26:34)
  • Key Takeaway: Rosalind Franklin and Maurice Wilkins were set up for conflict at King’s College due to administrative miscommunication and fundamental personality differences.
  • Summary: Franklin was directed to work on DNA despite her initial grant being for colloids, and she was promised independence. Wilkins, reserved and conflict-averse, was Franklin’s senior colleague, leading to friction. Watson believed the structure would have been Wilkins and Franklin’s discovery had they collaborated effectively.
Photograph 51 Misconception
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(00:29:03)
  • Key Takeaway: Photograph 51 played no direct part in the discovery of the double helix structure; its importance was exaggerated in Watson’s unreliable memoir.
  • Summary: Watson’s account in The Double Helix is unreliable, and the idea that Franklin sat on the photo for a year while Watson instantly understood it is nonsensical. Watson was excited by seeing photos of both A and B forms of DNA, which only suggested a helix shape, not the full structure. Watson and Crick primarily used trial and error model building based on known chemistry.
Nobel Prize Rules and Franklin’s Acknowledgment
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(00:37:20)
  • Key Takeaway: Rosalind Franklin could not have won the 1962 Nobel Prize because she died in 1958, and the prize is limited to three recipients.
  • Summary: Crick acknowledged Franklin’s key work when nominating himself for the prize in 1961, stating her data helped confirm their model’s correctness. The discovery itself was not immediately seen as earth-shattering, as DNA was not universally accepted as the genetic material until the structure was known.
X-ray Crystallography Basics
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(00:39:32)
  • Key Takeaway: X-ray crystallography involves firing X-rays at a crystal to generate a diffraction pattern, which requires complex mathematical interpretation to infer the molecular structure.
  • Summary: The technique was initially developed for minerals, not biological molecules, and won the Braggs a Nobel Prize. The resulting pattern, like the ‘X’ shape in Photograph 51, suggests features like helicity but does not reveal the exact structure, orientation, or number of strands.
Crick’s Central Dogma
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(00:47:18)
  • Key Takeaway: Crick’s ‘Central Dogma’ posits that information flow is unidirectional: DNA to RNA to protein, with no pathway from protein back to DNA.
  • Summary: Crick developed this idea after being prompted by George Gamoff’s letter about the ‘genetic code.’ The dogma argues against the inheritance of acquired characteristics because changes in proteins cannot alter the DNA sequence. This principle remains without known exceptions nearly 70 years later.
Post-Nobel Life and Generosity
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(00:52:44)
  • Key Takeaway: Despite his fame, Francis Crick maintained a generous correspondence with the public, though he declined participation in the Nobel Prize sperm bank.
  • Summary: Crick used a form letter to manage the influx of requests following his Nobel Prize. He wrote kind, detailed letters to members of the public, including a young boy writing a school project on the importance of DNA. He also provided annual financial support to the Skeptic Society.
Crick’s 1971 Breakdown
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(00:57:33)
  • Key Takeaway: Crick suffered a nervous breakdown in 1971 after publishing a completely erroneous theory on chromosome organization, teaching him not to fall in love with his own ideas.
  • Summary: Crick became overly excited about his chromosome theory, publishing it quickly in Nature and believing it would surpass the double helix discovery. He also developed the panspermia hypothesis around this time. He crashed and burned, leading to a period of depression and a subsequent, calmer approach to research.
Crick’s Move to Consciousness
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(01:00:08)
  • Key Takeaway: Francis Crick’s move to consciousness studies was influenced by his appreciation for sensory experience, including psychedelic use and building a desert home.
  • Summary: Crick built a house in the desert in the early 1990s, a place where he felt at home, possibly influenced by his experiences with LSD and cannabis in the mid-60s. His shift to consciousness research, beginning as early as 1947, aimed to establish materialist bases for the mind, rejecting ‘spookiness’ or religious explanations. He decided to concentrate on visual perception because stimuli are relatively easy to control compared to other senses like smell.
Visual Neuroscience and Neural Correlates
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(01:03:25)
  • Key Takeaway: Crick’s 1970s Scientific American article laid out the necessity of detailed neuroanatomy and molecular tools to find the neural correlates of consciousness, starting with visual perception.
  • Summary: Crick argued for a detailed neuroanatomical understanding of the brain, noting the vast difference in neuron counts between humans (80 billion) and flies (5,000), whose connectome is now mapped. He proposed studying visual perception to establish neural correlates—cells active when a specific stimulus is seen—as the starting point for understanding consciousness. Subsequent research confirmed the existence of highly specific, yet distributed, neural correlates for recognizing objects like Jennifer Aniston.
Critique of Current Consciousness Theories
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(01:08:49)
  • Key Takeaway: The field of consciousness studies has lost its way since Crick’s death, evidenced by over 200 competing ’theories of everything’ that lack Crick’s focus on enabling experimental next steps.
  • Summary: Since Crick’s death, the field has fragmented, resulting in over 200 theories of consciousness, suggesting a lack of consensus on fundamental definitions, unlike established sciences. Crick’s approach was to propose testable hypotheses for experimentalists, not grand, untestable theories of everything. The speaker notes that the next step following the identification of neural correlates is still awaiting discovery.
Crick’s Role and Scientific Influence
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(01:10:00)
  • Key Takeaway: Francis Crick popularized consciousness as a scientifically acceptable topic, acting as a ‘gadfly’ to ensure computational models of the brain remained rooted in biology.
  • Summary: Crick was instrumental in making consciousness a legitimate scientific pursuit, partly responsible for the wave of popular books on the subject, despite rarely conducting experiments himself. While in San Diego, he acted as a ‘gadfly’ to the Parallel Distributed Programming Group (ancestors of LLMs), criticizing models like backpropagation for lacking biological grounding. His famous ‘Astonishing Hypothesis’ asserts that identity and free will are merely the behavior of nerve cells and molecules, summarized as ‘You’re nothing but a pack of neurons.’
Contrasting Crick and Watson’s Social Views
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(01:16:50)
  • Key Takeaway: Crick rationally self-censored public commentary on social issues after recognizing his own prejudices, whereas Jim Watson’s later public statements became increasingly offensive and extreme.
  • Summary: Crick held some regrettable views on eugenics in the 1960s, but he stopped making public comments on non-scientific matters after the mid-1970s, recognizing his lack of curiosity and thick-headedness on politics. In contrast, Jim Watson reportedly became convinced of genetic determinism, leading to highly offensive racist and sexist remarks in his later years. Crick’s willingness to stop pontificating outside his expertise is contrasted with Watson’s tendency to amplify extreme views when met with opposition.
Future Research on Heredity
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(01:24:49)
  • Key Takeaway: Historians of science accept that the concept of heredity was not understood by humanity until the late 18th or early 19th century, a fact often surprising to the general public.
  • Summary: The guest’s next book, The Idea of Heredity, aims to convince the public that the concept of heredity was not scientifically established until the late 18th or early 19th century. This challenges common assumptions people hold about inherited traits, such as those observed in animal breeding. The research into this topic is currently situated in the 15th century.