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- 1). Fill a kitchen sink with hot water, just to the height of the glasses.
- 2). Fill the top glass with cold water. Add a few ice cubes to make the water even colder.
- 3). Lower the glasses into the sink, keeping the rim of the top glass above the water level. Hold the glasses in this position for about 30 seconds.
- 4). Tug gently on the lower glass to loosen it. The cold water should cause the top glass to contract while the hot water makes the bottom glass expand, loosening its grip.
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