Photo: Glenn Fleishman

Go and check out Glenn Fleishman's fantastic set of photos from the Jet Propulsion Lab's sandbox, where the scientists get to hang out and play with one of Curiosity rover's siblings.

Last week, scientists used ice caves in Austria as a stand-in for Martian caves, testing spacesuits and rovers in the freezing chambers. This week: We go to the desert near Baker, California, where NASA is testing out its Curiosity rover. Curiosity is 86 days away from landing on the real Martian surface.