Coin in the freezer: Simple life hack protects your health - many people don't know it. If the refrigerator defrosts, food quickly goes bad due to the interruption of the cold chain.
The coin trick can even protect against food poisoning, as “RTL’s” reports. After returning from vacation or a longer trip, all you need to do is look at the coin in the fridge and consumers can be assured of security. The ice in the cup will also melt - and the coin will sink.