Do you wonder anytime that why people in North India are aggressive while people in South India concentrate on education? So when continuous invasions started in India, the invaders mostly came by the North part of India as in South India the land is blocked by seas and ocean. So the environment of north became aggressive as they have to fight from the invaders. In this evolution of this environment result is that every north indian borns with wrestling in his or her blood. Whereas very few of invaders could reach to the southern part so the environment of South became peaceful so that they could concentrate on education and development. And the results are in the front of eye.