Teacher: We all know that heat causes an object to expand and cold causes it to contract. Now, can anyone give me a good example?
John: Well, in the summer the days are long, and in the winter the days are short.
Teacher: We all know that heat causes an object to expand and cold causes it to contract. Now, can anyone give me a good example?
John: Well, in the summer the days are long, and in the winter the days are short.
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