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