Eric Walker added Mach-effect gravitational assist (MEGA) drive, EmDrive and Alcubierre drive to Speculative physics, and added Speculative physics to Physics
Eric Walker added a number of topics and a number of links to Physics, and added Physics to Science, engineering, mathematics and the humanities
Eric Walker added RF resonant cavity thruster - Wikipedia and Gravity, Gizmos, and a Grand Theory of Interstellar Travel | WIRED to EmDrive, and added EmDrive to Speculative physics
Eric Walker added a number of links to Alcubierre drive, and added Alcubierre drive to Theory of relativity and Speculative physics