When he “finally did it, after weeks of frustration, he was overcome by ‘a great sense of accomplishment and utter relief.’ Looking back, he realizes the new generation of ‘speedcubers’ — Yusheng Du of China set the world record of 3.47 seconds in 2018 — might not be impressed. ‘But, remember, this had never been done before.'” NYT: He Invented the Rubik’s Cube. He’s Still Learning From It.