Mysterious Magnetic Anomaly Unveiled by Mesopotamian Bricks

Ancient Mesopotamian bricks, dating back to the third and first millennia B.C., have helped confirm a mysterious anomaly in Earth's magnetic field that occurred 3,000 years ago. Iron oxide grains within the clay of these bricks recorded changes in Earth's magnetic field when they were heated, allowing scientists to reconstruct changes in the magnetic field over time. This finding not only sheds light on the ancient anomaly but also provides a new method for dating artifacts that do not contain organic material.