Magnetohydrodynamics, experimental branch of physics founded by the work of Michael Faraday. MHD studies the dynamics of electrically conducting fluids. Examples of such fluids include plasmas, liquid metals, and salt water. The idea of MHD is that magnetic fields can induce currents in a moving conductive fluid, which create forces on the fluid, and also change the magnetic field itself. 1968 saw the first application to UFOs thanks to Ph.D. Stanton Friedman, while in 1973 Prof. Auguste Meessen reports on previous works; finally in 1974 comes Jean-Pierre Petit with his advancements. While these researchers believe a MHD propulasion is possible, there are certain problems that prevent us from building a MHD-based spacecraft.