The Mind Was Built for Something

John Tooby had a simple, radical idea: the human mind isn't a blank slate. It's more like a Swiss Army knife, shaped over millions of years to solve very specific problems — spotting a cheater, choosing an ally, reading a threat, falling in love.

Before Tooby and his wife and collaborator Leda Cosmides, psychology mostly asked what does the mind do. They asked a stranger, better question: what was it built to do, and by what?

The answer, they argued, was hiding in plain sight — in the hundred thousand generations we spent as hunter-gatherers, long before cities, writing, or money existed. Our brains are still tuned to that world. Jealousy, disgust, generosity, tribalism — these aren't cultural accidents. They're ancient tools, still humming along inside modern skulls, often wildly mismatched to modern life.

Tooby spent his career trying to map that architecture — piece by piece, adaptation by adaptation — treating the mind less like a mystery and more like an intricate machine that could, in principle, be understood. He helped found an entire field to do it: evolutionary psychology.

What made him remarkable wasn't just the theory. It was the audacity of the ambition — to take biology, anthropology, neuroscience, and cognitive science and weld them into one coherent account of human nature. Colleagues remember him as fiercely rigorous, endlessly curious, and quietly generous with his ideas.

He died in November 2023, leaving behind a discipline that didn't exist before he helped imagine it — and a simple, lasting provocation: to understand ourselves, start with the question of what we were built for.

Distilled from Edge