Perfect example: I distinctly remember THREE "cancer cures" - but only because they were all developed at universities in my area, each one was local news (for a day) and everyone talked about each one, each time. Then they stopped talking about it when the next thing came up - and the cure was never brought up again - so people weren't reminded.

Of course this may mean that the news (as with the article above) was over-hyped or the scientists were lying - or honestly mistaken; it could also mean conspiracy - but I don't know which. Such is life...