Randi distinguishes between pseudoscience and crackpot science. Cupping has been characterized as a pseudoscience and its practice as quackery. Mainstream proponents accuse the creationists of conflating the two in a form of pseudoscience. Several social science studies have analyzed these positions as forms of denialism, pseudoscience, or propaganda. He is known for criticising religion, pseudoscience (including creationism) and new wave feminism. The demarcation between science and pseudoscience has philosophical and scientific implications. Popper proposed falsifiability as an important criterion in distinguishing science from pseudoscience. The boundary between fringe science and pseudoscience is disputed. Today, many cite parapsychology as an example of a pseudoscience. Astrology is generally regarded as pseudoscience. Distinguishing between proper science and pseudoscience is sometimes difficult. "Not even wrong" is a phrase often used to describe pseudoscience or bad science. Futurology is sometimes described by scientists as pseudoscience. Metabunk covers such topics as pseudoscience, UFOs and the paranormal. Novelty theory is considered to be pseudoscience.