The key to SpaceX's Falcon 9 rocket is not how it goes up, but what it does when it comes down. Built around a reusable first stage, the rocket puts objects in space and then lands safely back to earth on a floating drone platform. Or at least, it's supposed to. While the real rocket has had its share of failures and successes, this miniature one, created by YouTube user ajw61185, seems to work just fine.