I. The Philadelphia Experiment
In 1943, the U.S. military conducted a high magnetic field intensity experiment on a warship. When the magnetic field reached a certain level, green light smoke appeared around the warship, and then the crew became intermittently visible within this smoky haze. Afterward, these crew members would also frequently experience intermittent visibility while walking on the streets, and eventually, they disappeared without a trace, probably dissipating into nature. In the 1980s, the Jiangsu UFO Research Association had also planned to collaborate with Nanjing University to conduct some strong magnetic field experiments, but the plan was abandoned due to insufficient intensity.