In December 1972, the last humans left the moon, ending the famed Apollo missions and human exploration of the lunar surface. Now one private space company dreams of not only returning humans to the moon, but of building a more permanent residence there by 2021. In this episode of The Current podcast, Michael Copeland speaks with Randa Milliron, co-founder and CEO of Interorbital Systems, about the progression of private space exploration and her company's plans to start a lunar colony in the near future.