What can people screening see?When we travel in public places, we will pass through people screening. Everyone knows that people screening is to detect dangers, such as metal objects. When the human body carries illegal metal objects through the people screening, the police will be called. So you ma

What is people screening?James Clerk Maxwell proved that force, magnetism, and electricity are related. That is, when current is applied to the copper wire coil wound on the metal nail, the metal nail is magnetized. The people screening is to use this scientific principle to detect whether there are