Knock, knock, knock: look inside the refrigerator

There are things you don't believe. "InstaView" is the name of the latest technical achievement from the South Korean electronics multinational LG. The concept: You knock on the refrigerator and it becomes transparent. This means you no longer have to open it to think about what you have, what you need, what you might need, or what you might not need. Sounds logical. The only question that remains is whether, in the ten-year life of a refrigerator, it will save more energy and CO2 than the technological gadget requires to manufacture it. If not, the gadget will still be an attraction at every party. With a knock guarantee.