Christian Science is a nontrinitarian Christian religion whose adherents are members of the Church of Christ, Scientist. Church members are known as Christian Scientists or students of Christian Science, and the church is sometimes informally known as the Christian Science church. It was founded in 1879 in New England by Mary Baker Eddy, who wrote the 1875 book Science and Health with Key to the Scriptures, which outlines the theology of Christian Science. The book was originally called Science and Health; the subtitle with a Key to the Scriptures was added in 1883 and later amended to with Key to the Scriptures. Eddy continued editing this text across the following 35 years until her passing in 1910. The book became Christian Science's central textbook, along with the Bible, and by 2001 had sold over nine million copies.