Coin in the freezer: Every vacationer should know this bizarre life hack. If the refrigerator defrosts, food quickly goes bad due to the interruption of the cold chain.
All you need is a coin and a plastic cup. The coin is then placed on the ice in the cup and the cup goes back into the freezer. 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 life hack is very simple, but in an emergency it can even protect against food poisoning.