EmDrive is a possible propulsion system granting no apparent expulsion of propellent. It has been reason of hot debate with strong criticisms from the scientific community championed by Sean Carroll and John Baez. Notwithstanding this, NASA went ahead performing in-depth experiments to test this technology. It was announced that, on December this year, a paper will appear in a reputable journal reporting on the last measurement campaign. But to today the paper leaked out on reddit. The results, at a first sight, appear to be striking confirming the effect, with all the possible mundane disturbing causes excluded. You can also find other material there as a small video.
I hope this will go properly evaluated by the scientific community moving to a more serious addressing of this effect.
Update: The links were removed from the subreddit’s moderator. I have copies of these files but I do not mean to publish them in any form.
Update: Here is the published paper.