NEW YORK – DNA from an infant who died in Alaska about 11,500 years ago is giving scientists the best look yet at the genetics of the ancestors of today’s native peoples of the Americas. Decoding the infant’s complete set of DNA let researchers estimate the timing of key events in the ancestral history of today’s Native Americans and indigenous peoples of Canada and Central and South America. Experts said that although the new work doesn’t radically change the outlines of what scientists have thought, it provides more detail and better evidence than what was available before. The infant girl was buried about 50 miles southeast of Fairbanks, and her remains are the earliest known in the far north of North America, said anthropologist Ben Potter of the University of Alaska Fairbanks.