You made about 35,000 decisions today. The unsettling part? Most of them were influenced by mental shortcuts you never noticed.

In the 1970s, psychologists Daniel Kahneman and Amos Tversky conducted a deceptively simple experiment. They asked people to estimate whether the percentage of African countries in the United Nations was higher or lower than a number generated by spinning a wheel. The wheel was rigged to land on either 10 or 65. People who saw 65 guessed dramatically higher than those who saw 10, even though they knew the number was random.

This is anchoring bias — our tendency to rely too heavily on the first piece of information we encounter. It's why car dealers show you the expensive model first, why salary negotiations hinge on who names a number first, and why a $100 wine bottle makes the $40 bottle seem reasonable.

But anchoring is just one of over 180 documented cognitive biases. There's the availability heuristic, which makes plane crashes feel more likely than car accidents because they're more memorable. There's the Dunning-Kruger effect, where the least competent people are often the most confident. And there's confirmation bias, the grandfather of them all — our instinct to seek out information that confirms what we already believe.

Here's the truly fascinating part: knowing about these biases doesn't make you immune to them. Kahneman himself admitted he was still susceptible. The value isn't in eliminating biases — it's in building systems and habits that account for them. The best decision-makers aren't the smartest people in the room. They're the ones who understand how their own minds deceive them.