Here's why the U.S., China, India, Japan and others are rushing back to the moon

To date, only five nations, the U.S.,Russia, China, Japan and India, have completed a successful soft landing on the moon. But bolstered by evidence of the presence of water and other natural resources, many more nations and private companies are now seeking to get to the moon. And whoever is able to establish a significant lunar presence first could have big implications on Earth as well as the cosmos.