Researchers are still puzzling through what happened to the ancient Maya civilization, which mysteriously dwindled. New ...

Add Yahoo as a preferred source to see more of our stories on Google. (Esben_H/iStock/Getty Images Plus) The Fermi paradox asks: If there are other civilizations in the Universe besides ours, why ...

Human history is littered with expired civilizations, and scholars and archaeologists have made a determined effort to understand why and how civilizations collapse. They've found that symptoms like a ...

This publication has been produced to meet accepted Accessibility standards and contains various accessibility features including concise image descriptions, a table of contents, a page list to ...

Add Yahoo as a preferred source to see more of our stories on Google. President Trump warns a "whole civilization" could die as his deadline for Iran to strike a deal and reopen the Strait of Hormuz ...

The Fermi paradox asks: If there are other civilizations in the Universe besides ours, why haven't we yet made contact? Researchers who study this paradox – also called the Great Silence – generally ...