Defining what is fringe science can pose some difficulties. There are a number of beliefs that are considered scientific – astrology, UFO abduction, ESP, levitation – but their lack of rigorous scientific evidence classifies them as pseudoscience. Fringe science often looks at bizarre and far-out ideas in already established studies. However, unlike pseudoscience, fringe science conducts itself using the scientific method. The ideas studied by fringe scientists are not supported by the mainstream.