Archaeologists have long known that complex societies can rise, flourish and then disappear so completely that only scattered ...

Global temperature increases over the past thirty years, visualized. Credit: NOAA/NCEI Earth's average global temperatures have been steadily increasing since the Industrial Revolution. According to ...

For decades, the search for extraterrestrial intelligence has largely been predicated on a specific assumption: that advanced civilizations will inevitably grow, expanding their energy consumption and ...