A Sudoku Secret to Blow Your Mind - Numberphile Numberphile Watch on (via Numberphile) Simon Anthony (from Cracking the Cryptic) reveals the Phistomephel Ring - a hidden feature of ALL Sudoku puzzles.

Even though most of us know logic gates like the back of our hands, we just found this awesome explanation video you can use to teach kids in a very fun way — Using nothing but dominoes. Produced by ...