What will the astronauts who return to the Moon with NASA’s Constellation program drive? I had a chance to find out last October as a member of NASA's Desert Research and Technology Studies (Desert RATS) during the field test of the Lunar Electric Rover (LER) at Black Point lava flow in Arizona.

Of course the designers also used digital computers, but in the 1960s computers were giant machines that you programmed with punched cards, and they were strictly reserved for only the most complex mathematical calculations. As the 40th anniversary of the Apollo 11 mission approaches, we are constantly reminded of how incredible that voyage was.