Maybe you didn’t want your kid to play with toy guns or toy soldiers, so you gave him some wholesome, creative Lego bricks. Which works until he uses the interlocking plastic pieces to make a tank.

MINNEAPOLIS, Minnesota — Daniel Siskind never meant to build a business empire out of LEGOs; he was just looking for a way to pass the time after his youngest daughter went to bed. "She would go to ...

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