Your body runs hidden maths before you ever feel a hunch

Have you ever made a split-second call, swerved the car, snapped at someone, said yes before you'd finished thinking, and only worked out why afterward? Yuval Noah Harari argues that what felt like a mysterious impulse was actually a calculation, just one your body ran for you instead of one you ran on paper.

His case rests on a simple but unsettling idea: organisms are algorithms. An algorithm is nothing more mystical than a set of steps used to solve a problem, the kind that runs a vending machine or a tea recipe. Harari's example is a baboon eyeing bananas on a tree while a lion lurks nearby. To decide whether to risk it, the baboon effectively needs to weigh distance, running speed, whether the lion looks hungry or drowsy, and how hungry the baboon itself is. No baboon does this with a notepad. Instead, its whole body becomes the calculator: hunger, fear, the mouth watering at the sight of fruit are all felt as sensations, and the outcome of the calculation simply arrives as a feeling, confidence pushing the baboon forward, or dread pulling it back.

The same logic, Harari argues, runs in humans, and it runs far more of our lives than we'd like to admit. When a peahen looks at a peacock's tail and feels drawn to it, powerful algorithms honed over millions of years are converting tiny visual cues into an estimate of reproductive odds, all in milliseconds, all felt as attraction rather than counted out. Even Nobel laureates in economics, Harari points out, make ninety-nine percent of their real decisions, spouse, career, home, through the refined algorithms we call emotion, not through a calculator.

This matters because it flips a common assumption. We tend to treat feeling and calculating as opposites, gut versus head. Harari's point is that the gut is doing the calculating, just faster, and largely out of sight. That doesn't mean every impulse should be obeyed blindly; many of our urges were tuned for problems that no longer exist, a taste for sugar that made sense when fruit was rare, a young man's appetite for risk that once won mates in a world without seatbelts or Instagram. But it does mean dismissing a strong hunch as 'just emotion, not logic' misses what it actually is: logic, running on a body instead of a spreadsheet.

Start noticing the next strong gut reaction you have, a pull toward a decision, a flash of dread about a plan, and instead of brushing it aside, try naming what variables it might actually be weighing, risk, memory, energy, timing. When something significant is on the table, let that felt sense register fully before you reach for a pros-and-cons list, because the feeling is already partway through solving the problem. And when an urge feels stronger than the situation warrants, a craving, a flash of anger, a reckless impulse, pause and ask what ancient problem this particular algorithm was built to solve, because it may be running calculations tuned for a world that no longer exists around you.