Min tapes a piece of string to each of two table tennis balls. He hangs the balls so that they are close to one another but do not touch. Later, he finds that they have pulled together. They are now touching. What could explain why the two balls are now touching?

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1. Min tapes a piece of string to each of two table tennis balls. He hangs the balls so that they are close to one another but do not touch. Later, he finds that they have pulled together. They are now touching. What could explain why the two balls are now touching?