Rubik’s Cube Inventor Spills a Secret in Tel Aviv

Erno Rubik reveals what makes his puzzle the best-selling toy of all time: 'It’s like the Mona Lisa smile.’

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The room is filled with gamers — 20-something geeks turned cool kids — in flip-flops and black superhero T-shirts. They’re talking digital shop at last week’s annual Digital-Life-Design Tel Aviv Innovation...