As a completely informal aside, I remember running across an article in a science journal back in 1990s about the development of memory metal. It seemed legit at the time and reminded me of the Roswell debris story, but I haven't heard or seen anything else about it since. Same goes for the invention of a heat resistant coating, but I saw that on TV. They took an egg and painted it with the coating and put a blow torch to it and nothing happened. The story ended with them saying that the inventor had caught the attention of the military and that was the last I heard about that too. Same goes for a number of other inventions.
One they seem to be trying hard to keep from getting too popular is a cancer treatment that uses the patient's own enhanced immune system cells and can be administered via an IV drip. Stories I've seen on it have been very positive including patients that are showing no signs of cancer afterwards. The treatment has been available in Japan for a long time, but the big problem seems to be the politics over here that prefer to use drugs and radiation. So I wouldn't be surprised to find that there are some really exotic next-gen inventions out there now that most of us just don't know about. Still doubtful about something as exotic as antigravity propulsion drives though.
Oh yes, and I just caught a clip of @Christopher O'Brien on a History Channel show about Bigfoot and underground caves 
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There's definately interest in that treatment in the states Randal, just that it works good for some and not at all for others.
Killing Cancer Through the Immune System | ucsf.edu
The treatment consists of infusing antibodies that enhance the immune system to recognize cancer cells and attack it. What’s more, since the immune system has a built-in memory, it continues to go after cancer cells, so the response can be longer lasting and more complete.
The trick is that this treatment doesn’t work for everybody, and researchers don’t yet understand why. But when it does work, the results have been particularly impressive.
“Although there is a 30-year history of people and institutions trying to develop immunotherapy approaches to cancer, it has only been in the last 10 years that we’ve broken through and have been able to impact cancer using immunotherapy,” said
Jeffrey Bluestone, PhD, executive vice chancellor and provost of UC San Francisco.
Whatever cure they find, will be over a decade to late for my dad, 5 and 6 years too late for my mother and sister, if the yanks ever had a 'war on cancer' the world would be free of it in a decade.
