I remember that one of the most special inventions in Japan is that an eye drop is like two small funnels, and then it is inserted into glasses, and then the glasses are put on, so that it will not drip outside. Although it seems that this invention is really useful, the designer didn't consider it. If people shake hands at the edge of the funnel, the average person will only drop one or two drops, but one or two drops will not flow out of the funnel at all.
The second special invention of chicken ribs is the head support frame. The invention is to let people who go to work rest on the subway. This bracket can be hung on a pole on the subway and then put their heads on it. Although it looks really useful, over time, your cervical spine and lumbar spine are stretched very uncomfortable. If you are a short person, it is very uncomfortable.
Finally, the magnifying glass cigarette lighter. He borrowed the function that a magnifying glass can focus in the sun. He can put cigarettes under a magnifying glass and light them with the help of sunlight, but lighters are very common now. You can buy lighters in convenience stores everywhere in the street. Why do you need to bring such a big magnifying glass, and it is particularly fragile?