Ch 7 howa la3'a meno hgat fi emte7an elterm w 5 proof bs 3lena April 10, 2013 tb w d haga wehsha wla helwa?:d
3mlti eh fel physicS ... April 10, 2013 hahaha la na mush bhb aklm 3n nfsy:d as2l/y l physics 3mlt fia eh:d