It is one of the most famous questions in science, and it was asked, as legend has it, over lunch. Enrico Fermi, the ...

Across deserts, jungles, and polar ice, new discoveries are quietly stretching the story of civilization further back in time than many of us learned in school. As archaeologists debate mysterious ...

Here, we explore six notable civilizations that have collapsed, shedding light on some of the causes behind their demise and some interesting parallels relative to today. Ancient civilizations that ...