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I am a doctor ,selected in upsc cse 2013 , currently posted . love to share my knowledge in explaining concepts logically .
UPSC CSE 2013 CLEARED currently posted DR. RANJEETA
Basics of universe formation 1 dark secrets of the black hole 2 what is the big bang theory 3formation of earth ,stars and planets 4 our solar system and it's planets 5 evolution of earth