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Some pseudoscience contradicts scientific evidence. Some merely claims an authority it does not possess.
Some pseudoscientific facts even make their way into school textbooks. Several people are actively fighting pseudoscience; a web search (for example http://www.google.com/search?q=pseudoscience) can reveal several such pages.
Pseudo Science is also known as junk science.
Popular examples of pseudoscience are astrology?, numerology, cartomancy?, and many other fortune-telling methods; dowsing?, channeling?, and other psychic? claims; accupuncture?, [applied kinesiology]?, and iridology?. Many of these things have been studied scientifically as well, but without success. Pseudoscientific medical practices often become quite popular, because they often work well because of the placebo effect.
One of the best hunters of pseudoscience on the web is Skeptic Dictionary: http://skepdic.com/