It took 40 years for us to get back to the surface of the Moon. The adventures of China's late Jade Rabbit rover ended an absence that would have been unthinkable to families clustered around their TV sets in the 1960s, watching the incredible achievements of the Apollo Program. Where did we get off track? Jekan Thanga from ASU's School of Earth and Space Exploration, explains the science and politics behind Cory Doctorow's new novella, "The Man Who Sold the Moon."