Researchers are utilizing ancient jars and amphora handles from Jerusalem and Rhodes to study Earth's magnetic history. The study focuses on Hellenistic pottery to uncover changes that occurred over 2,000 years ago. Findings reveal a significant and sharp drop in magnetic field strength during the second century BCE. This discovery provides critical data on the planet's geomagnetic fluctuations. Additionally, the research may offer archaeologists new tools to improve dating techniques. By analyzing the magnetic signatures trapped in the ceramics, scientists can better map ancient environmental shifts. The project highlights the intersection of archaeology and geophysics.