I recently found an article about chi kung, a type of healing, similar to reiki and things like it. it gives an intersting description of it and applications of it and while reading the article, it said that chinese nuclear scientists have been doing experiments with it and have determined it to be a sort of "low frequency modulated infrared radiation" that some people can exert. I wish I knew how they were doing this testing but anyway, I thought you all might find it interesting. There is indeed a scientific aspect to the spirit. Now if only american scientists would pick up the slack so we can make spirit charged laser swords, the world would be right.
http://people.howstuffworks.com/chi-kung-exercises7.htm