Summary:
- The Earth's magnetic field has been weakening over the past 200 years, and scientists are trying to understand why.
- Magnetic crystals found in ancient pottery and bricks could hold the key to unlocking this mystery. These crystals can record changes in the Earth's magnetic field over time.
- By studying these ancient magnetic crystals, scientists hope to gain a better understanding of the complex processes that drive the Earth's magnetic field and how it has changed throughout history.