Showing posts with label downloads. Show all posts
Showing posts with label downloads. Show all posts

Friday, October 31, 2014

An Illustrated Guide to Relativity


لأي حد نفسه يبدأ في النسبية الخاصة .. كتاب بسيط ورائع جدا والشرح فيه من البداية بطريقة سهلة

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Friday, August 8, 2014

COSMOS : Carl Sagan



كتاب أكتر من رائع للعبقري [ Carl Sagan ]

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