NEW YORK (AP) — Ancient mummy DNA recovered in Chile has yielded the firmest evidence yet that European colonization brought smallpox to the Americas. Researchers found evidence of two smallpox infections in ancient DNA from the leg bone fragments of an adult man and woman. Scientists also compared the genes in this version of smallpox to other versions and fit it neatly between European strains from medieval times and later versions. This was important molecular evidence, suggesting that the strains of smallpox infecting people in the Americas evolved first from Europe. Exactly which population brought smallpox to the Americas from the Old World remains unclear, said the study authors.