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two societies with different values. If we want to encourage equilibrium, then we can think of sharing as transfer of energy. There are three physical modes through which to transfer energy: radiation, convection and conduction. There are clear analogies of how these modes are used socially to achieve equilibrium across boundaries. For example, radio and TV radiate ideas across borders. Teacher-student exchanges act as intellectual and social convection currents. Brands and foreign aid conduct values. Mixing cultures gives them common ground. We move toward social equilibrium when we share ideas and values that have the same foundations.