Scientists used a special tool to analyze soil and rocks on Mars to find out what minerals contain iron. They also looked at the amount of different types of iron and magnetic particles in the soil. This helps us understand how the Martian surface has changed over time due to weathering processes. The tool they used is small and light, and it could be used on a Mars lander in the future. They tested it on samples that are similar to Martian soil. They also studied how basalt rocks change when exposed to different gases, which helps us interpret data from Mars better.