[saghm]

I think they meant the opposite; physics throws things out as soon as there's a need for exceptions, and there are examples of that.

[IAmBroom]

Well, once they have a better explanation.

We know that mass of matter does not explain even half of the mass observed in the Universe; we haven't thrown out the explanations of mass and inertial gravity, but have a placeholder called "dark matter" to refer to the missing explanation.