Alex Tu, left, an Advanced Placement student, works during a computer science class in Midwest City, Okla. There's been a sharp decline in the number of computer science classes offered in U.S. secondary schools.
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A Push To Boost Computer Science Learning, Even At An Early Age

Many are calling it a national crisis that so few K-12 public schools in the U.S. teach computer science basics. Now some non-profit and for-profit companies are trying to change that. NPR's Eric Westervelt reports.