Ancient DNA research in the past decade has revealed that European population structure changed dramatically in the prehistoric period (14,000–3000 years before present, YBP), reflecting the ...

This measure provides a clear picture of the overall age structure of a community or country. This ratio is a key indicator of the demographic pressure on the workforce. A rising ratio suggests ...

"We were quite surprised," Dones continued. "Spirals are seen in Saturn's rings, disks around young stars and galaxies. The ...