Gold appears not to have been coined at Athens till the time of the Macedonian empire, with the exception a solitary issue of a debased coinage in 407. But from a very early period the Asian nations, and he Greek cities of Asia Minor and...

A map from 1898 of the United States showing the Industrial Sections of the contiguous 48 states at the time. "Owing largely to differences in surface structure, climate, and soil, the great productions of our country are confined more...

When are humans most happy? To gather data on this question, Matt Killingsworth built an app, Track Your Happiness, that let people report their feelings in real time. Among the surprising results: We're often happiest when we're lost in...

Mountain Goats live on remarkably steep, craggy cliffs for most of their lives, spending only about a quarter of their time in less forbidding meadows and nearby fields. The steep slopes offer safety from predators such as mountain lions...

A map from 1898 showing the population distribution of North America, Central America, and Caribbean to Puerto Rico. The map shows areas of sparse to heavily populated concentrations at the time. "Many thousands of white men from western...