Most geneticists agree that Native Americans are descended from Siberians who crossed into America 26,000 to 18,000 years ago via a land bridge over the Bering Strait. But while genetic analysis of modern Native Americans lends support to this idea, strong fossil evidence has been lacking.
Now a nearly complete skeleton of a prehistoric teenage girl, newly discovered in an underwater cave in the Yucatán Peninsula, establishes a clear link between the ancient and modern peoples, scientists say.
The wingspan of Pelagornis sandersi dwarfs that of today's biggest flier, the royal albatross, whose span measures a "mere" 11.5 feet (3.5 meters). And it rivals that of the largest flying bird on record: Argentavis magnificens—a South American condor with a 23-foot (7-meter) wingspan that glided among the mountaintops of the Andes six million years ago.
"Pelagornis was certainly much lighter and a better 'flier'" than the vanished giant condor, says paleontologist Antoine Louchart of France's Institute of Functional Genomics in Lyon, who was not involved with the study.
King Richard III's rediscovered resting place is turning out more mysteries this summer. Excavators finally lifted the heavy lid of a medieval stone coffin found at the site in Leicester, England, only to reveal another lead coffin inside.
In 7,500 BCE, this city in the Mesopotamian region (now Turkey) held thousands of people and is believed by many to be one of the world's earliest urban settlements. But the culture of the people here was unlike anything we know today. First of all, they built the city like a honeycomb, with houses sharing walls. Homes and buildings were accessed by doors cut into the roofs. People would stroll on the streets across these roofs, and climb down ladders to get to their living quarters. Doorways were often marked with bulls' horns, and dead family members were buried in the floor of each home. It's not clear what happened to the culture of the people who lived in this city.