“When a SpaceX Falcon rocket flew itself back to its Florida launch site last December, the feat was hailed as a key step in company founder Elon Musk’s quest to develop an inexpensive, reliable reusable rocket. But that was just half the story. SpaceX is gearing up to launch Discovr, which will keep an eye on both the weather in space and the goings on with our home planet. The more challenging and potentially revolutionary step was accomplished on Friday when another Falcon rocket dispatched a cargo ship to the International Space Station, then turned around and landed on a platform gently bobbing in the Atlantic Ocean.”