How long-dead missionaries are unwittingly helping further scientific understanding of the South Atlantic Anomaly.

CHR Comment: The article references the rise, decline, and ruin of seventeenth century Jesuit missions in southern Brazil where Guarani people clashed with Spanish and Portuguese soldiers. Bricks used in the mission buildings recorded information about the magnetic poles of the earth.

Source: 17th-century Ruins Could Unravel Mysteries of Earth’s Magnetic Field – The Crux