Here are a couple more from our favorite eye in the sky.
Both half-meter resolution images were snapped from space by the GeoEye-1 satellite, which also took those fantastic pics of the National Mall on Inauguration Day.
First, the Great Pyramid in Giza, Egypt, the tomb constructed around 1560 BC for the Fourth dynasty King Khufu. Sitting just in front of the Great Pyramid is the Great Sphinx of Giza. Built a few decades later, it is the world’s oldest known monumental sculpture.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.