How many fairy tales and science fiction works are associated with wonderful invisibility hats or some other tricks that make a person invisible. Is it possible to achieve invisibility and real life? Has any research been carried out in this direction? Our next issue is devoted to all these questions, telling about the so-called Philadelphia experiment with the American destroyer Eldridge. The book’s text has been translated from the original language using an artificial intelligence system. In most cases, the translation is accurate and clear, but occasionally there may be incorrect phrasing or individual words left untranslated.