When you rub balloons with wool and place them near bits of paper, you find three categories of behavior. Balloons attract wool and bits of paper but repel other balloons. Pieces of wool attract balloons and bits of paper but repel other pieces of wool. Bits of paper are attracted to both the balloons and the pieces of wool but do not react with other bits of paper. When we have three distinct behaviors, why do we only need two types of charge in our model?
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