Artist's conception of NASA's planned Mars rover, Curiosity. See other rovers in our gallery (Image: NASA / JPL-Caltech)
From New Scientist:
SOMETHING is moving. Two robots sitting motionless in the dust have spotted it. One, a six-wheeled rover, radios the other perched high on a rocky slope. Should they take a photo and beam it back to mission control? Time is short, they have a list of other tasks to complete, and the juice in their batteries is running low. The robots have seconds to decide. What should they do?
Read more ....