Concept explainers
Colin and Tubbes. When first grader Cohn comes home from school each day, his pet hippo Thbbes is waiting to greet him. Because Tubbes is so large and enthusiastic, Cohn does not enjoy these blubbery greetings, so he tries to avoid them by switching between the back door and the front door to thwart Tubbes. When Colin succeeds in avoiding Tubbes, he feels a satisfaction “gain” of 5. If Cohn enters the front door and finds Tubbes waiting, he feels a satisfaction gain of
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