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"In the last four years, "Sesame Street" has set itself a much larger goal: teaching nature, math, science and engineering concepts and problem-solving to a preschool audience - with topics like how a pulley works or how to go about investigating what's making Mr. Snuffleupagus sneeze."

"through a painstaking process that includes not just software development but also testing, data gathering, observations of classroom dynamics, interviews with teachers, assessments of children's learning and controlled comparisons. This school year, in 16 classrooms in New York and California, researchers will assess children at the beginning and end of a four-week unit to see whether the apps - and an accompanying set of materials for teachers - make any difference. "