A witness later stated that Payne had shown him explosive black powder in the days leading up to the flight. Crosthwaite was ...

“Iron is more abundant ... Sagawa developed the neodymium magnet through sintering — a process that involves making powders, compacting them through pressing, and then baking them in a ...

In fact, the only thing needed to make them is iron and nitrogen, plus an understanding of crystal structure and some engineering ingenuity. To start things off, what even is a permanent magnet?