This is the one I find fascinating -- a British academic physicist was able to wrangle money from DARPA to pursue his idea of [Quantized Inertia](https://en.wikipedia.org/wiki/Quantized_inertia) (QI), which if harnessed promises high-speed travel as a selling point, but the scientific goal is to improve on models of general relativity.



I'm sticking with plain old Newton, lots of interesting physics still to be rooted out in e.g. fluid dynamics.