Poor richard's aphorisms often succeed because of their implied metaphors, or metaphors that do not state explicitly the two things being compared. in aphorism 18, "if your head is wax, don’t walk in the sun," what does a wax head refer to and explain the meaning of this aphorism.

This aphorism is about not exceeding your limits. If your head is made out of wax, then it will melt if you go out in the sun. Similarly, if you have a big exam, you shouldn't go party the night before, or any similar comparison that you can think of.

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