Puzzle
After returning from a trip of several days, a woman opened her freezer. It was as cold inside as it should be, and the food stored there was frozen. Yet when she looked at a clear, lidded container that had been there since before she left, she decided to throw away the food, just to be on the safe side. Both before she left and when she returned, the container held nothing but ice made from water. No one had entered the house while she was away. Why did she decide to throw away the food even though it was frozen?