Scientists have uncovered evidence that sheds light on a little-known ice age that may have contributed to the decline of the ...

Learn more about how income inequality may increase the potential for political instability and may have led to the collapse of the Roman Empire and the Han Dynasty.

Unusual rocks on an Icelandic beach were dropped there by icebergs, adding to evidence that an unusually cool period preceded ...

Elon Musk has linked modern-day population decline to ancient Rome, warning that wealth-driven 'hedonism and envy' could ...