The scientific wonderers at What If fast-forward through billions of years of geological and biological change to show the ...

Millions of people around the world will pause, at least for a moment, to mark Earth Day. The annual event is Wednesday.

Human history is littered with expired civilizations, and scholars and archaeologists have made a determined effort to ...

New fossil discovery reveals 535 million-year-old worms, annelids, that were already crawling and swimming, reshaping early ...