Scientists were recently baffled by DNA evidence that revealed the existence of a genetically unknown group of early South American settlers. Archaeologists are continually adapting their models for how human populations spread from Asia through North America to South America, and this new research is bound to alter those theories once again. The Associated Press reports that the researchers analyzed ancient DNA from 21 individuals who lived in Colombia's Altiplano Cundiboyacense region thousands of years ago. Located near current-day Bogotá, this area was also close to the ancient land bridge connecting South and Central America, the route that early human...