This one's been making the rounds lately, but we'd be remiss if we didn't take a moment to acknowledge any invention that boasts to be the "Segway of the sky," which is just what upstart Air Buoyant claims its so-called "Vertipod" could one day be.  According to Danger Room, this flying machine employs a gasoline or ethanol powered 440-cubic-centimeter engine to propel one brave along individual at speeds up to 40 miles per hour while hovering 15 feet off the ground, with a propeller, naturally, spinning perilously close to your feet.  What's more, Air Buoyant's Pete Bitar says the contraption could even have consumer appeal, with a $10,000 kit planned that "can be assembled in a weekend. "[Via Tech Digest