Guides & explainers
The reasoning behind the tools. How percentages actually work, what a loan really costs, why BMI misleads, and how to pick a password that holds up. Written to answer the question, then get out of the way.
Health Exercise Is Excellent for You and a Weak Way to Lose Weight
A 30 minute run burns about what is in one chocolate bar, and appetite claws back much of it. Here is what exercise is actually good for.
Explainers How Anagram Solvers Work Without Checking Every Permutation
Twelve letters have 479 million arrangements. A good solver never generates a single one, and the trick behind it is worth knowing.
Productivity Why Counting in Days Changes What You Do About a Deadline
Ninety days and three months are the same interval, and people act on them differently. The research on temporal framing is unusually practical.
Explainers Learning Morse Code: Why the Chart Is the Wrong Place to Start
Almost everyone learns Morse from a table of dots and dashes and hits a hard ceiling. Here is why, and what the two methods that work do instead.
Productivity The Pomodoro Technique: Which Parts Actually Work
Twenty five minutes is arbitrary. The fixed interval, the enforced breaks and the interruption log are the parts doing the work, and one is usually skipped.
Money Price Is Not Cost: Working Out What Things Actually Cost You
The expensive coat is often the cheap one. Cost per use, total cost of ownership and the honest-use problem, in one place.
Money The Rule of 72: The Only Compound Interest Maths You Need in Your Head
Divide 72 by a rate and you get the doubling time. It works for savings, debt, inflation and fees, and it is accurate to within a few percent.
Explainers The Longest Word Is Usually the Wrong Move
Word game skill is mostly rack management, two-letter words and board awareness. The big play is the part beginners focus on and experts often decline.
Explainers Why Computers Count in Binary and Programmers Count in Hex
Base 10 is a biological accident. Base 2 is a physical one. Here is why hexadecimal sits between them, and why 255 keeps appearing everywhere.
Health Why Your Watch Overestimates How Many Calories You Burned
Validation studies find consumer wearables off by 20% to 90% on energy expenditure, almost always too high. Here is what they measure and what they guess.
Productivity Working Days vs Calendar Days: Why Deadlines Are Closer Than They Look
Six weeks sounds like plenty. It is thirty working days, and probably fewer than twenty once holidays and existing commitments are counted.
Money Debt Snowball vs Avalanche: Which One Should You Actually Use?
The avalanche method always costs less in interest. The snowball method gets finished more often. Here is how to work out which difference matters more for you.
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