From solving algebra equations to exploring world history, or understanding scientific concepts, there’s a bit of everything in this challenge – so much so that you’ll finally have the opportunity to ...

This iceberg in Scoresby Sound, East Greenland, is one of many frozen sights in the country. Photograph by Frans Lanting, Nat Geo Image Collection Craters at Lake Myvatn in Iceland are among the ...

Homo economicus is a theoretical abstraction that describes a rational human being. As such, neoclassical economic theories represent people as ideal decision-makers with complete rationality, perfect ...

Clay Halton was a Business Editor at Investopedia and has been working in the finance publishing field for more than five years. He also writes and edits personal finance content, with a focus on ...