Blog

PNG, JPG or WebP? — I Converted the Same 3 Images and Measured the File Sizes

4-7-8 Breathing Counts Are a Ratio, Not Seconds — Comparing Box and 4-8 Breathing by Breaths per Minute

How Accurate Is a Guitar Tuner? — 440Hz, Cents, and Why Low Bass Notes Read an Octave High

How Far Can You Get in a Color Discrimination Test? The Limits of Your Eyes — and of Your Screen

Why a 1TB Drive Shows Up as 931GB — The Unit Conversions That Quietly Go Wrong

Base64 Is Not Encryption — Why 5 Korean Characters Become 20, and What Breaks in URLs

Why Is My JSON Invalid? What the Parser Catches — and the One Thing It Lets Through

Why Meeting Times Across Time Zones Keep Going Wrong (DST and the UTC Trap)

What Is a Good Typing Speed? Why WPM, CPM, and Korean "Ta-su" Never Match

What Is a Good Reaction Time? Why 250ms Is Normal and How to Measure It Properly