Several folk in posts in this sub-forum have said that it's important to allow 'a hundred flowers to bloom' - let's be open to all ideas and inputs, at least initially, because you never know which one among these may just turn out to be the discovery of the millenium - or words to that effect. So I got to thinking (yes, it hurts), how many things from left field have made it to mainstream, in the last 50 or 100 years? Not many, was what I thought immediately. I mean, apart from sprites (here's a link to an older report, so you can get a flavour of how odd they once seemed: http://www.agu.org/sci_soc/sprites.html), what is there? And sprites were hardly a phenomenon which the UFO crowd had at the top of their list of hard evidence (were they?); it was more long-haul pilots! So, casting the net wide, wide to begin with, what left-fielder has made it to mainstream?