Have you ever been in the situation where you leave your country house only to return to lumpy milk? Well, this is a very obvious sign that the power went out for several hours while you were away. Should you not have such obvious signs you may be in jepordy of eating putrid foods.
The solution?
Freeze a small amount of water in a plastic cup then place a coin on top of the frozen water.
When you return after many days away, check to make sure the coin is on top of the water and not frozen at the bottom. . .
If you're in a pinch, you could always place a coin on an ice cube tray, (if your organized enough to have one filled and ready to go ;)
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