When the crisis is performed here, and both sides have the same value on the axis. Whether it is whatever we call was born exposed to those already known. For example, we use a scale, scale of China. At the end of the scale, we will put the food down one side to. The end of the other side, we will put the weight of the pendulum to pendulum weight comparison between food with us to put the pendulum to pendulum and food until it is balanced. Pendulum with the balanced diet is the scale does not lean to either side, and then we will be able to calculate how much weight the food pieces. Based on weight, pendulum, and this is the advantage that humans get from studying the subject balance.
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