http://ar.wikipedia.org/wiki/%D9%85%D8%BA%D8%A7%D9%84%D8%B7%D8%A9_%D8%A8%D9%87%D9%84%D9%88%D8%A7%D9%86%D9%8A%D8%A9

https://class.coursera.org/learning-001