I would put it way above No. 1, in a category of its own. This is the most astonishing news that I've had in my lifetime--that actual scientists (not s-f writers) at NASA, for godssakes, are seriously saying that warp drive may be possible and are proceeding with tests!
Good God, Scuba! This is like the discovery of fire (or rather humans learning to control fire)! It could utterly transform human life for the next hundred thousand years, or more likely, forever. Granted, it's still just math, but so was the atom bomb for a time--and not for very long.
I would say that the other 14 items are awesome or fascinating--but this one is truly mind-blowing. I never ever ever expected to hear this from NASA. I figured that maybe our great-grandchildren might be alive when this math was figured out and testing begun--or when some other means of very fast space travel was devised or stumbled upon. But not soon and certainly not in my lifetime. And not without a leap beyond Einstein.
Wow! I mean really and truly...