Nobody could figure out how it got thrust?
It's still doing it. And they still don't know how.
As efficient as this type of propulsion may sound, it defies one of the
fundamental concepts of physics - the conservation of momentum, which
states that for something to be propelled forward, some kind of
propellant needs to be pushed out in the opposite direction.
The real excitement began when those Eagleworks researchers admitted back in March
that, despite more than a year of trying to poke holes in the EM Drive,
it just kept on working - even inside a vacuum. This debunked some of
their most common theories about what might be causing the anomaly.
Martin Tajmar, a professor and chair for Space Systems at Dresden
University of Technology in Germany, has played around with his own EM
Drive, and has once again shown that it produces thrust - albeit for reasons he can't explain.
And a(nother) kicker:
It might turn out that we need to rewrite some of our laws of physics in order to explain how the drive works.
Something I read a long time ago stuck with me, a scientist talking about those laws of physics(nature, etc.):
"The 'Laws of Nature' are no such thing; they're just how we understand things to work, based on our current understanding. Therefore they're subject to change at any time should new information come up."