EM drive and NASA

Now a team of physicists have put forward an alternative explanation - it turns out the EM drive could actually work without breaking any scientific laws, if we factor in a weird and often overlooked idea in quantum physics - pilot wave theory.
For those who need a refresher, the crux of the problem here is that the EM, or electromagnetic, drive appears to produce thrust without any fuel or propellant.
That's awesome because it means we can get to space with way less pay load - it's proposed it could even get us to Mars within 72 days.
But it's also perplexing, because, according to Newton's third law, every action must have an equal and opposite reaction. So without pushing any propellant out one end, the drive shouldn't be able to produce thrust in the opposite direction.
Still, as a NASA peer-reviewed paper showed last year, the drive does produce thrust, at least as far as we can currently tell. And a relatively large amount of thrust at that. We just don't know how.

https://www.sciencealert.com/physicists-have-a-weird-new-idea-about-how-the-impossible-em-drive-could-produce-thrust

A tentative theoretical explanation for the mysterious, "impossible" EmDrive propulsion system was published in the "Journal of Applied Physical Science International" in August. First proposed by British engineer Roger Shawyer, the EmDrive is an asymmetric box that looks like a truncated cone, with a standing microwave field inside that -- apparently violating known physical laws -- seems able to generate thrust and propel the device.
Meanwhile, China's state media says that the country's scientists have perfected a working EmDrive prototype and are preparing to test it in space. NASA is also funding a feasibility study for an interstellar mission powered by a related exotic propulsion method.

https://www.cnet.com/news/theoretical-physicists-get-closer-to-explaining-how-nasas-impossible-emdrive-works/