Johnny Matheny, who lost his arm to cancer in 2008, is a pioneer of advanced arm prosthetics. “Everybody tells me that I’m the only one in the United States that has had my stump into every advanced prosthetic in the…

Forget homemade volcanoes and models of the solar system. Today’s science fairs feature self-driving cars and computer-generated simulations of galaxies. And the prizes, if you’re really good, award way more than extra credit. The most ambitious young inventors have…

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