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Hi Milo

Sure you can quantify gravity...but not explain how it works. I believe you are a scientist as well. Einstein was working on this before he died...the Unified Field theory...but nothing has been done on it since.

Gravity is one of the three fundamental forces of the universe; along with the Strong force and Electromagnetism (they once thought there was a "weak force" of atomic decay, but it has been seen to be an aspect of Electromagnetism).

Electromagnetism is the easiest to understand in that we know the carrier; photons. It is also easy to measure and predict. It can be "tested". It is both an attractive and a repulsive force (opposites attract, like repels).

The Strong Force opposes the Electromagnetic repulsion that protons exert upon each other in the atomic nucleus. The carrier is also known. It is also easy to measure and predict. It can be "tested". It is only an attractive force.

Gravity is the universal attraction of mass. The carrier is unknown. It is also easy to measure and predict. It can be "tested" (they tested Einsteins theory that gravity would effect time). It is also only an attractive force.

On an atomic scale the Strong Force is predominant, and keeps our atoms together.

On our scale Electromagnetism is responsible for photosynthesis, oxidative phosphorylation, electricity, microwaves, light, X-rays and just about everything else.

On a celestial scale Gravity is predominant and the other forces really don't even register on the scale.

So if you mean "not explain how it works" you mean that the carrier particle is unknown you are correct. But we know how to measure and predict Gravity and can measure Relativistic effects with it, and therefore I would say that we certainly "know how it works".

And I'm still shaking my head in disbelief about you saying that Gravity cannot be tested.

And I'd say reconciling the Electromagnetic and the "weak force" would be a something that has been done on the Unified Field Theory. Now there are only three forces to reconcile.

And I'd say that there is always the

Wile E. Coyote test of Gravity.

He can test Gravity for you.

Wile E. Coyote "SUPRA-Genius!"