High in the Sky

We've already had a whole badge in this series about airplanes, but regular old planes aren't the only thing that humans have invented to fly! There are lots of OTHER vessels -- some still in use and others now defunct -- that humans have designed, built and used to TAKE TO THE AIR! This week we'll be focusing on some of these more, er, UNUSUAL flying machines, how they came to be and how (and IF!) they're used today. Let's take off!