How Intelligence Grew Over Time
Intelligence grows out of a long chain of increasing complexity. Physics made chemistry possible, chemistry made biology possible, and biology eventually produced brains that could store and use information. In humans, this process reached a new level because the brain could not only react to the world, but also represent it with symbols, combine those symbols, and build larger ideas from smaller ones.
Human beings gained an unusual advantage when this symbolic ability joined practical tool use. Language let knowledge move from one mind to another. Writing let knowledge survive beyond one lifetime. Computers then pushed this process further by storing and manipulating information outside the brain, allowing human intelligence to extend beyond biological limits.
Kurzweil ties this history to a broader pattern: progress speeds up when information can be copied, improved, and shared. Evolution in genes took millions of years. Cultural learning moved faster. Digital systems move faster still. Once intelligence becomes partly non-biological, improvement no longer depends on slow changes in DNA.
He supports this view by pointing to earlier scientific revolutions. Charles Lyell showed that huge changes in the earth could come from small forces acting over long periods. Darwin then applied a similar logic to life, showing how many species could emerge from gradual variation and selection. Einstein used thought experiments to uncover hidden rules in physics, reaching E=mc² through careful reasoning rather than giant machinery. These examples show that deep complexity can come from simple underlying processes, and Kurzweil applies the same expectation to the mind.
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