Latest posts
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What Is Herd Mentality?
Cryptocurrencies double in a week. No change to the technology, no new utility. But everyone is talking about it, so people buy in. ‘If everyone else is doing it, it must be smart.’ The Original Discovery Observed across human societies since antiquity. Formally studied by Solomon Asch in the 1950s: he showed that even when…
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What Is the 10,000-Hour Rule?
The Beatles played ~1,200 live shows between 1960-1964, accumulating ~10,000 hours on stage before Beatlemania. They were good earlier, but not great. After 10K hours, they were unstoppable. The Original Discovery Malcolm Gladwell popularized this in ‘Outliers’ (2008), citing research by Anders Ericsson. But the idea predates Gladwell: sports coaches have long known that 10,000…
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What Is Parkinson’s Law?
You’re given a week to finish a report. You spend 3 days planning, 2 days writing, 1 day editing, 1 day formatting. If the deadline was tomorrow, you’d finish today—same quality report. The Original Discovery Cyril Northcote Parkinson observed this in British government in 1955. A bureaucrat took the same time to draft a memo—whether…
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What Is the Hawthorne Effect?
Employees are 20% more productive on the day their manager sits in their area. The next day, the manager leaves and productivity drops. Nothing changed except the presence of observation. The Original Discovery Researchers at the Hawthorne Works factory (1924) wanted to understand how lighting affects productivity. They dimmed the lights—productivity went up. They brightened…
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What Is the Barnum Effect?
A horoscope says ‘You are sensitive to the feelings of others, but sometimes hide your true feelings.’ 80% of people reading this think it’s specifically about them. It describes nearly everyone. The Original Discovery Named after P.T. Barnum’s famous (misquoted) line: ‘There’s a sucker born every minute.’ Psychologist Bertram Forer demonstrated it in 1949. He…
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What Is the Pygmalion Effect?
A coach tells a young swimmer ‘You have a gift for this.’ The swimmer trains harder, gets better coaching opportunities, and eventually makes the Olympics. Another equally talented kid is told ‘You’re okay, but not special.’ They quit at age 14. The Original Discovery Rosenthal and Jacobson conducted a famous 1968 study. They told teachers…
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What Is the Matthew Effect?
Two papers on identical findings are published. One by a Nobel laureate, one by an unknown researcher. The Nobel laureate’s paper gets cited 100x more often—not because it’s better written, but because Nobel laureates’ names attract attention. The Original Discovery Named after Matthew 25:29 in the Bible: ‘For unto every one that hath shall be…
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What Is the Butterfly Effect?
In 1989, a Libyan passport officer decided to stamp one more visa without proper paperwork. This led to the bombing of Pan Am Flight 103, which killed 270 people and changed aviation security forever. The Original Discovery Edward Lorenz, a meteorologist, discovered this principle in 1960 while running weather simulations on an early computer. He…
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What Is Goodhart’s Law? When Metrics Stop Working
Goodhart’s Law: when a measure becomes a target, it ceases to be a good measure. Here’s why metrics get gamed, real examples, and what to do instead.
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What Is the Pareto Principle (80/20 Rule)? How to Find the Vital Few
The Pareto Principle (80/20 Rule) says 80% of results come from 20% of causes. Here’s the origin, real examples, and how to use it to work smarter.
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What Is the Streisand Effect? Why Trying to Hide Something Makes It Viral
The Streisand Effect: attempts to suppress information online make it spread faster. Named after a 2003 lawsuit that turned a private photo into global news.
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What Is the Halo Effect? How One Trait Colors Everything
The Halo Effect means a positive impression in one area shapes how we judge everything else. Here’s the science, examples, and why it’s so hard to avoid.
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What Is the Bystander Effect? Why More Witnesses Means Less Help
The Bystander Effect shows that people are less likely to help in emergencies when others are present. Here’s the psychology, the Kitty Genovese case, and how to override it.
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What Is Murphy’s Law? More Than Just Bad Luck
Murphy’s Law isn’t just a joke. It’s an engineering principle with a real origin, a specific mechanism, and practical uses. Here’s what it actually means.
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What Is Confirmation Bias? Why We Find What We’re Looking For
Confirmation Bias makes us seek out information that confirms what we already believe. Here’s the science, real examples, and how to fight it.
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What Is Survivorship Bias? The Data You Never See
Survivorship Bias makes us focus only on successes while ignoring failures. The WWII bomber story, startup myths, and how to correct for missing data.
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What Is the Sunk Cost Fallacy? Why We Can’t Let Go
The Sunk Cost Fallacy makes us stick with bad decisions because of past investment. Here’s the psychology, real examples, and how to stop doing it.
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What Is the Dunning-Kruger Effect? (With Real Examples)
The Dunning-Kruger Effect explains why beginners are overconfident and experts are uncertain. Here’s the science, real examples, and why it matters.
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I Made a 40-Level Psychology Quiz. Here’s Which Laws Most People Get Wrong. (AI Generated)
A free 40-level psychology quiz where you read a real scenario and name the law — Murphy’s Law, Dunning-Kruger Effect, Sunk Cost Fallacy, and 37 more. No login, no install.
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I Built 100 Historical Figure Life Simulators. Here’s What I Learned About Decision-Making.
I started with one. It was a Nelson Mandela simulator. You make the same 8 decisions he made — before you see what he actually did. Should he advocate armed resistance? Should he accept the conditional release offer after 21 years in prison? Should he negotiate with the apartheid government at all? The point wasn’t…