toygeek writes: Before Curiosity, before Opportunity, before Spirit, and before Sojourner, the very first robot to land on Mars was this little guy, way back in December of 1971. Called PrOP-M, the rover was part of the Soviet Union's Mars-3 mission, which had the potential to deploy the first ever mobile scientific instruments onto the Martian surface. Article also contains Russian video on early rovers.
Thus spake the master programmer:
"When a program is being tested, it is too late to make design changes."
-- Geoffrey James, "The Tao of Programming"