coondoggie writes: "Engineering an aircraft that can go fast, carry usable amounts of equipment and people and hover has always been one of aviation's greatest challenges. Sure there are plenty of fast helicopters but they are usually limited in the amount of weight they can carry. And there have been a few successful vertical take-off and landing (VTOL) jets — the AV-8 Harrier is the industry standard — and while it is fast, it can carry one person, the pilot. The future-looking folks at the Defense Advanced Research Projects Agency would like to change all that with a project they call the VTOL X-Plane program."
The perversity of nature is nowhere better demonstrated by the fact that, when
exposed to the same atmosphere, bread becomes hard while crackers become soft.