Although common sense repeatedly tells us that inanimate objects can't move by themselves, it sometimes sure seems like they do. No matter how sure you are that you closed the back door, it will always find a way to sneak back open and let the cold air in, which is unacceptable in wintertime considering the low temperatures outside and energy prices. Not to mention the lengthy discussions arising from a simple question like "Honey? Did you close the back door?" Both reasons, and others, prompted the Elektor lab to find a solution.
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