The Atharva Veda (Sanskrit: ????????, Atharvaveda from atharv??as and veda, meaning "knowledge") is the "knowledge storehouse of atharv??as, the procedures for everyday life".The text is the fourth Veda, but has been a late addition to the Vedic scriptures of Hinduism. The Atharvaveda is composed in Vedic Sanskrit, and it is a collection of 730 hymns with about 6,000 mantras, divided into 20 books. About a sixth of the Atharvaveda text adapts verses from the Rigveda, and except for Books 15 and 16, the text is in poem form deploying a diversity of Vedic matters. Two different recensions of the text – the Paippal?da and the ?aunak?ya – have survived into modern times. Reliable manuscripts of the Paippalada edition were believed to have been lost, but a well-preserved version was discovered among a collection of palm leaf manuscripts in Odisha in 1957. In contrast to the 'hieratic religion' of the other three Vedas, the Atharvaveda is said to represent a 'popular religion', incorporating not only formulas for magic, but also the daily rituals for initiation into learning (upanayana), marriage and funerals. Royal rituals and the duties of the court priests are also included in the Atharvaveda. Ayurveda, the traditional system of medicine in ancient India, suggests a link between this Veda and medicine. The Atharvaveda was likely compiled as a Veda contemporaneously with Samaveda and Yajurveda, or about 1200 BC - 1000 BC. Along with the Samhita layer of text, the Atharvaveda includes a Brahmana text, and a final layer of the text that covers philosophical speculations. The latter layer of Atharvaveda text includes three primary Upanishads, influential to various schools of Hindu philosophy. These include the Mundaka Upanishad, the Mandukya Upanishad and the Prashna Upanishad.