This is one of the more ingenious and creative books I've seen in a long time. Chock full of great facts and information about the Mars rovers, the Mars project, and Mars itself. The photos are the real gem, though. Built-in 3D glasses fold out from an inside-cover flap and transport you to the surface of Mars via a ton of 3D images (acquired by the rovers). Mars is, needless to say, both alien and mesmerizing. Truly one of the most enjoyable astronomy books on the market for kids and adults. Great fun.