Dhaka, Feb. 18 -- A careful historical survey (carried out under the leadership of Bangla Academy, Dhaka around 2002) pertaining to the agriculture process in Bengal over nearly the last three thousand years revealed that initially, a larger number of people in Bengal, like the rest of South and Southeast Asia were nomads. However, things appear to have started to change from about the 7the century BC when the population realised that it was easier for their livestock as well as for themselves if they had settled habitation. In this context agriculture and looking after domestic animals were preferred as it not only provided security but also steady food supply. It also spared the population the problem of searching for food in the surrou...