Earth Day is on Tuesday, April 22, this year. The annual observation is set aside to increase awareness around environmental issues like climate change, pollution, endangered species and other ...

In this one-hour special, The Story of Fascism in Europe, Rick travels back a century to learn how fascism rose and then fell in Europe — taking millions of people with it. This special is also ...

The Roman Empire had two main populations: gods and humans. By its end, there was only one god left. How, and why, did he reign supreme?