A City Guide To Mehendiganj for Over millions of years of evolution, changes in genetic structure allowed rudimentary forms of culture and politics to emerge. As this culture and politics developed, the genetic leash became increasingly stretched, allowing further and faster cultural and political development. Ethical discourse, for instance, was impossible before humans gained the capacities for speech and reason. These capacities, in turn, could not develop 36 thinking politics until humans underwent the physiological evolution that produced their uniquely structured larynx and brain. Once the capacities for speech and reason allowed early human beings to engage in moral thought and action, however, the boundaries of the activities that were circumscribed by our genetic blueprints became increasingly stretched. Moral precepts, for example, both restricted the types of behavior that instinct and appetite stimulated and induced other kinds of behavior that instinct and appetite did not stimulate. That is to say, not only do our genes hold our politics and culture on a leash, but our politics and culture also hold our genes on a leash. A City Guide To Mehendiganj 2016.