Summary:

• **How Scientists Study Ancient Diseases**: Researchers can look at the bones and teeth of people who lived thousands of years ago to find clues about what diseases they had. By studying these remains carefully, scientists can learn what illnesses affected people in the past and how their bodies dealt with them.

• **DNA Tells Us Stories**: Scientists can extract tiny pieces of genetic material (DNA) from old bones to identify disease-causing germs that infected people long ago. This helps us understand how diseases have changed over time and which ones have always been around.