Example: The EM drive. While everyone was skeptical, it was real scenc. It dealt with an area of physics that there wasn't 100% agreement on, there was a written formula, and it was testable.
Absolutely not. It does not have any valid science theory behind it. the experiments show no such force outside errors and noise. And if it works, *IT WOULD BE A OVER UNITY ENERGY DEVICE*. Conservation of momentum and energy are related. They are aspects of the same conservation.
The perversity of nature is nowhere better demonstrated by the fact that, when exposed to the same atmosphere, bread becomes hard while crackers become soft.