Salvatore Cezar Pais's proposed "UFO patents" for the U.S. Navy envision radical propulsion and physics concepts—such as a medium-crossing hybrid vehicle, a compact fusion device, a gravitational wave generator, a spacetime-… #aliens #apr2026 #interestingengineering #oh #ovni #uap #ufo #ufosky #usa https://ufo-uap.news/BJgi.html