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Longer reads on the ideas behind the tools — written plainly, checked carefully.
ArticleWhat Makes a Password Strong in 2026Entropy, length vs complexity, passphrases, and password managers: what actually makes a password strong in 2026.
ArticleBMI: What It Measures, What It Misses, and How to Use ItHow BMI is calculated, what its categories mean, where it fails (athletes, age), and how to use it sensibly.
ArticlePercentages in Everyday Life: 7 Calculations Worth KnowingDiscounts, tips, interest, percentage change and reverse percentages: 7 percentage calculations with worked examples.
ArticleWhen Units Go Wrong: Real Disasters Caused by Conversion ErrorsThe Mars Climate Orbiter, the Gimli Glider, and other true stories of unit conversion errors, and how to avoid them.
ArticleHow Age Is Actually Calculated: Leap Years and Edge CasesLeap years, month lengths, and time zones: how age calculators really compute your age in years, months, and days.