Christian Science is a set of beliefs and practices belonging to the metaphysical family of new religious movements It was developed in 19th-century New England by Mary Baker Eddy (1821–1910), who argued in her book Science and Health (1875) that sickness is an illusion that can be corrected by prayer alone. The book became Christian Science's central text, along with the Bible, and by 2001 had sold ten million copies in 16 languages.