Microbes are everywhere on Earth. They’re in the soil, the rocks, the oceans, and in your body! The organisms living on you are called your microbiome. Your microbiome is important for your health. We wanted to know if we could use DNA to learn about the microbiome of mummified ancient Egyptian people. We used a new technique that matches up broken pieces of DNA. On the mummies, we found microbes that can cause gum disease. We also found evidence of germs that cause leprosy, hepatitis, and other infectious diseases.