The coffee can become cold

My friend asked, " What will you do to a cup of hot coffee to become cold?"

There were varied answers from the young people on the floor. Add water to it. Stir it. Blow it with a fan. These were few of their answers. All of them were right.

"Just do nothing", my friend said, after nobody can think of any other reason. Almost everyone was startled. Nobody thought about it. That included myself.

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