of which fall into five categories. http://www.viswiki.com/en/Yusuf_Ma_Dexin   Dr. Abdus Salem Mohammad Abdus Salam [2] ( Urdu : محمد عبد السلام ) (January 29, 1926; Jhang , Punjab, British India – November 21, 1996; Oxford , England) [3] was a Pakistani theoretical physicist , astrophysicist and Nobel laureate in Physics for