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Secret inventions. Surely many of you do not know that the patent office assigns a secrecy classification to any invention if it believes that the developed technology may pose a threat to national security. Some patents may remain secret for several years, while others may remain secret for decades. Today we will tell you about those inventions that were classified at one time, they tried very hard to find them, so watch the video to the end, it is really worth it MegaShowTV - these are the most interesting, shocking, funny, strange and creepy tops. A lot of information about countries and travel, beautiful nature and amazing animals, historical facts and real events. We try to choose the most interesting, tough and popular. If you are interested in the educational and entertaining channel MegaShow TV, then feel free to subscribe: https://goo.gl/9lYT2p Group in VK: https://vk.com/megashowtv Watch the most mysterious and incredible: https://goo.gl/FcCqxk And also learn about new technologies of the future: https://goo.gl/jKPIKs