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Khan Academy [http://www.khanacademy.org/] - 2010-02-26 14:34:26 - public:xxx education, finance, free, kids, learn, lectures, math, mathematics, online, physics, reference, resources, science, teaching, tutorials, video, videos - 17 | id:794 - הדגמות לניסויים ואיך עובדים דברים