Debunking the myths about how busy professionals "should" learn English — plus a practical vault of neuroscience-backed techniques that actually stick.
Why do you keep forgetting vocabulary even after looking it up multiple times? Your brain isn't broken — it's working exactly as designed. This post explains the Ebbinghaus forgetting curve, the testing effect, and SM-2: the science behind vocabulary that actually sticks.
SM-2 calculates the exact moment your brain is about to forget a word — then catches it. Full formula, step-by-step trace, and why most apps get it wrong.
Spaced repetition is the algorithm behind how your brain actually stores new words long-term — and most developers are running it wrong. Here's how it works, what the data shows, and how to use it in under 15 minutes a day.