And there are plenty of interesting Earth Day facts to learn! But, first, a little background. Earth Day falls on April 22 ...

So, reader, what’ll it be? Does the sheer scale of Google Earth put it over the top or are your memories of HQ Trivia fond enough to send it to the next round? External link ...

In honor of Earth Day, the Giraffe Blog has put together 50 awesome facts about space, the atmosphere, the sea, and what's under the earth. It's an easy reminder that our Blue Marble is an ...