X-Ray Vision

In science fiction stories, X-ray vision has generally been portrayed as the ability to see through layers of objects at the discretion of the holder of this superpower. People often pretend to have this ability through the use of X-ray glasses, which are a special type of "joke-around" or prank-gag toys with the secret of its "x-ray properties" being unknown. The goal is usually to see through clothing, usually to determine if someone is carrying a concealed weapon, but sometimes for purpose of seeing a person's private parts. In the non-fictional realm, X-ray have many practical uses in the fields of science and medicine. While there are devices currently extant which can "see" through clothing (using terahertz waves), most are quite bulky. However, there are night vision equipped video cameras that can be modified to see through clothing at a frequency just below visible light. The best known figures with "x-ray vision" are the fictional superhero Superman who once had a heat... full article at wikipedia