President Barack Obama hosted the second annual White House Science Fair, honoring more than 100 students from 40 different competitions across the U.S. aimed at nurturing students in science, technology, engineering and mathematics. "Most of our successful corporations ... were started by engineers -- people who use science and math to create things and solve problems," writes Bill Nye. "For the United States to remain the world leader in technological innovation, we need more engineers and more scientists."

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