'Impossible' EM drive may actually be impossible after all

"If something sounds too good to be true then it probably is, so goes the old
saying. And unfortunately, it now seems this is also applicable to the
"impossible" EM drive, first touted over a decade ago as a way to generate thrust
using microwaves, thereby eliminating the need for fuel in deep space exploration.
The initial research caused huge excitement, with scientists venturing it would be
possible to travel from Earth to Mars in just a few weeks if the technology could
be scaled up, but new tests suggest that's unlikely to happen because it doesn't
appear to work at all."

See:

https://www.engadget.com/2018/05/23/...ble-after-all/