Dunning-Kruger Effect : Knowing the limits of your intelligence requires a certain level of intelligence, so some people are too stupid to know how stupid they are.

Hedonic Treadmill : Expectations rise with results, so nothing feels as good as you’d imagine for as long as you’d expect.

Weasel Words : Phrases that appear to have meaning but convey nothing tangible. “Growth was solid last quarter,” or “Many people believe.”

Cobra Effect: Attempting to solve a problem makes that problem worse. Comes from an Indian story about a city infested with snakes offering a bounty for every dead cobra, which caused entrepreneurs to start breeding cobras for slaughter.

Hanlon’s Razor: “Never attribute to malice that which can be adequately explained by stupidity.”

Behavioral Inevitability : “History never repeats itself; man always does.” – Voltaire

McNamara Fallacy : A belief that rational decisions can be made with quantitative measures alone, when in fact the things you can’t measure are often the most consequential. Named after Defense Secretary McNamara, who tried to quantify every aspect of the Vietnam War.

Anscombe’s Quartet : Four sets of numbers that look identical on paper (mean average, variance, correlation, etc.) but look completely different when graphed. Describes a situation where exact calculations don’t offer a good representation of how the world works.

Pareto Principle : The majority of outcomes are driven by a minority of events.