The Silurian Hypothesis asks whether signs of truly ancient past civilizations would even be recognisable today.

For decades, science fiction writers have tried their best to prepare us for eventual contact with aliens. Their efforts are dominated by several recurrent tropes. There's the invasion by a warlike ...

Learn how the first civilization in Mesopotamia depended on tides and how it responded when faced with a major environmental challenge. Many millennia ago, the tides turned for ancient Sumerians who ...