Question: Christian science was developed by Mary baker Eddy and came about during a period called what?
Context: The Christian Science Hymnal is a collection of hymns sanctioned for use in Christian Science services including Sunday services and Wednesday evening testimony meetings, as well as in occasional informal hymn sings.  It includes both traditional Christian hymns, traditional hymns with minor adaptations better suiting Christian Science theology, and hymns unique to Christian Science, including seven poems by the denomination's founder Mary Baker Eddy set to various tunes: "Christ, My Refuge", "Christmas Morn", "Communion Hymn", "Feed My Sheep", "Love", "Mother's Evening Prayer", and "Satisfied".  Found in the Supplement section are the hymns, "I Need Thee Every Hour", "I'm a Pilgrim and I'm a Stranger", and "Eternity", which were originally included in the Hymnal in accordance with [Mrs. Eddy's] wish." 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, 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 over nine million copies. The Destiny of The Mother Church, by Bliss Knapp is a controversial book published by Christian Science Publishing Society in 1991.  Knapp and his parents, Ira O. and Flavia Stickney Knapp, all knew Mary Baker Eddy.  His parents were students of hers and his father was one of the original members of the Board of Directors of The Mother Church.  Until 1991, the book was repeatedly rejected for publication by the Christian Science Board of Directors because of the depiction of Eddy as the fulfillment of biblical prophecy and equating her with Christ Jesus, a position which Eddy considered blasphemous.  Eddy identified the woman in the Book of Revelation not as a person, but as "generic man".  "Destiny's" publication caused divisions within the church, including several resignations of prominent church employees.  Critics claimed that the failure of the church's then-recent television venture, which had cost the church several hundred million dollars, had motivated the Board's reversal on publishing Knapp's book.  Knapp, his wife and her sister left wills that granted bequests totalling over $100 million (in 1990s dollars) promised to the church if the book were to be published.  The wills set a time limit of 20 years for the book to be published, otherwise the bequests were to be divided between Stanford University and the Los Angeles County Museum of Art, and the church would receive nothing.  The 1973 death of Knapp's wife set the date of the time limit to May 1993. The Christian Science Sentinel (originally the "Christian Science Weekly") is a magazine published by the Christian Science Publishing Society based in Boston, Massachusetts.  The magazine was launched by Mary Baker Eddy in 1898.  It includes articles, editorials, and accounts of healings from a Christian Science point of view. Virginia S. Harris was Publisher of The Writings of Mary Baker Eddy, President and founding Trustee of The Mary Baker Eddy Library for the Betterment of Humanity and Chair of The Christian Science Board of Directors between 1990 and 2004.  In these roles she was instrumental in expanding the availability of Mary Baker Eddy's primary work, "Science and Health with Key to the Scriptures" and increasing awareness of Mrs. Eddy's life and ideas.  The establishment of The Mary Baker Eddy Library enabled a large and valuable collection of 19th and early 20th century letters and artifacts to be available to the public for the first time. The Third Great Awakening refers to a hypothetical historical period proposed by William G. McLoughlin that was marked by religious activism in American history and spans the late 1850s to the early 20th century.  It affected pietistic Protestant denominations and had a strong element of social activism.  It gathered strength from the postmillennial belief that the Second Coming of Christ would occur after mankind had reformed the entire earth.  It was affiliated with the Social Gospel Movement, which applied Christianity to social issues and gained its force from the Awakening, as did the worldwide missionary movement.  New groupings emerged, such as the Holiness movement and Nazarene movements, and Christian Science. A Christian Science practitioner is an individual who prays for others according to the teachings of Christian Science.  Treatment is non-medical, rather it is based on the Bible and the Christian Science textbook, "Science and Health with Key to the Scriptures" (1875) by Mary Baker Eddy (1821–1910), who "discovered" Christian Science in 1866 and founded the Christian Science church in 1879.  According to the church, Christian Science practitioners address physical conditions, as well as relationship or financial difficulties and any other problem or crisis.  Practitioners are either "listed" or "unlisted," a designation that refers to a form of international accreditation maintained by The Mother Church, in Boston, Massachusetts. Rev. Irving Clinton Tomlinson (March 22, 1860 – October 1, 1944) was an American Universalist minister who converted to Christian Science, becoming a practitioner and teacher.  For a time, he lived as one of the workers in the household of church founder, Mary Baker Eddy, later writing a book about his experiences, called, "Mary Baker Eddy: Twelve Years with Mary Baker Eddy". The Mary Baker Eddy Library is a research library, museum, and repository for the papers of Mary Baker Eddy, the founder of Christian Science. The Christian Science Pleasant View Home is a historic senior citizen residential facility located at 227 Pleasant Street in Concord, New Hampshire, in the United States, It was built in 1927 by the Christian Science Board of Directors as a retirement home for aged Christian Science practitioners and other workers in the cause of Christian Science and occupies the site of "Pleasant View", Mary Baker Eddy's last home before moving to Chestnut Hill, Massachusetts, in 1908.  It is now Pleasant View Retirement, a senior independent living facility.  On September 19, 1984, it was added to the National Register of Historic Places.
Answer: The Third Great Awakening