A City Guide To Shuangcheng for (Mice, by way of contrast, not only nourish, shelter, and protect themselves, but start to reproduce by two months of age.) Many different aspects of human culture have developed in response to this biological constraint. The institution of marriage, the celebration of family life, and the development of educational institutions are only a few of the cultural artifacts that compensate for or take advantage of our lengthy period of childhood immaturity and dependence. These cultural institutions, grounded in biological constraints, greatly influence political life. As Aristotle observed, the springs of politics and justice are to be found in the extended bonding of parent and child.18 The nature of the rules, principles, customs, conventions, and understandings surrounding marriage, family life, and education differs markedly from culture to culture and even within the same culture. Yet the extent to which humans can wholly abandon these mores is severely circumscribed by the biological facts of human propagation and development. A City Guide To Shuangcheng 2016.