THE BILLION-DOLLAR BRAIN HE GAVE AWAY

When a technopreneur crafts a trading algorithm that beats Wall Street—and gives it away for free—you brace for either brilliance or bedlam.Under a canopy of chandeliers in Singapore’s Marina Bay Sands, Joseph Plazo stepped onto the stage, flash drive in hand.“This is the brain that beat the markets,” he said, lifting a USB. “And I’m