The idea of whether or not communication from other planets can be transmitted and received is discussed in this presentation. The various issues, such as relative stages of development, the ability to receive a transmission, and whether...

What constitutes a civilization? In a swift, engaging, and humorous fashion, John Green begins this edition of Crash Course History by exploring the symptoms of a civilization, such as surplus production, cities, social stratification,...

Legislatures cannot function without compromise. And a democracy cannot thrive without personal sacrifices by citizens.

After thousands of years as a hunter/gatherer, man built the first cities 5,000 years ago on the banks of the Euphrates in Southern Iraq. Civilization began. City life transformed the human race with the glorious cultures of Mesopotamia...