It's already unlikely we'll get a view as good as the ones collected in "Earth As Art," a new, free e-book from NASA. The collection has years' worth of beautiful satellite photos from around the world, reaching across Africa to Asia to Antarctica. But what's even more interesting, as NASA scientist Lawrence Friedl points out in the introduction, is that "these satellites can measure light outside of the visible range, so the images show more than what is visible to the naked eye." Here are our favorites.
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.