I should candidly admit that scientists are as prone as any of us to this tendency towards belief. I have become steadily less, rather than more, confident in my ability to distinguish pseudoscience from true science. I am close to certain that astronomy is a science; astrology is a pseudoscience. Evolution is science; creationism is pseudoscience. Molecular biology is science; homeopathy is pseudoscience. Vaccination is science; vaccination scares are pseudoscience. Oxygen is science; phlogiston was pseudoscience. Chemistry is science; alchemy was pseudoscience.