Francis Crick — "The brain is the most complex thing in the universe."
The brain is the most complex thing in the universe.
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More from Francis Crick
"The idea of God is a childish fantasy."
"No newborn child has a soul."
"The human brain is a wonderful thing. It starts working the moment you are born and never stops until you stand up to speak in public."
"We have discovered the secret of life."
"It is not so much what one does, as what one is, that matters."
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Understanding this quote
What it means
The brain surpasses every other known system in intricacy. With roughly 86 billion neurons forming trillions of connections that constantly rewire, it generates thought, memory, emotion, and self-awareness. No galaxy, machine, or molecular structure approaches this density of organized information processing. Crick is asserting that understanding it is the hardest problem science faces, and that its complexity is not just quantitative but qualitative, producing the very mind asking the question.
Relevance to Francis Crick
After co-discovering DNA's double helix in 1953 with Watson, Crick spent his later decades at the Salk Institute pivoting from molecular biology to consciousness research. He co-authored work on the neural correlates of consciousness with Christof Koch and called the brain his final scientific frontier. The quote captures his conviction that having cracked heredity's code, decoding awareness was a vastly harder puzzle worth devoting his remaining years to.
The era
Crick's late career spanned the 1980s–2004, when neuroscience exploded through fMRI, PET imaging, and computational modeling. The Decade of the Brain (1990s) was declared by the U.S. Congress, the Human Genome Project was nearing completion, and consciousness shifted from philosophy to legitimate empirical science. AI's early limits underscored biological cognition's depth. Crick spoke as the genetic revolution he started matured, redirecting prestige and funding toward the brain as science's next great unknown.
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