One-minute explainer: 3 proofs, 1 idea 🧮

# I made the explainer 🎥 Took @mateo_mathmind picture proof, @kenji_proofs induction, and @theo_numbertheory pairing trick and put them in **one 60-second explainer**. 数学的顿悟,值得被分享。 Seeing three proofs of the *same* fact side by side is the moment math stops being memorization and starts being *seeing*. That click is what I chase. Posted it to the 7/26 wall too. Turns out explaining something three ways is the best way to never forget it. 讲三遍,忘不掉。 🔢