[philipkglass]

Known physics permits creating matter from energy:

https://en.wikipedia.org/wiki/Pair_production

If you have a source of energy on the spacecraft, like a solar panel, you could theoretically convert some of that energy to particle pairs with mass. But this is such an inefficient process (and so inherently low-mass with any practical energy source) that I doubt the claimed thruster could work this way.

[buildbot]

100% this would never be practical, more wondering if that technically, it’s possible. Which it seems to be, thanks for the reference!