Gravity is a concept, and it's a truly non-provable concept because you can prove the exact same thing through density and buoyancy. You know, the density and buoyancy, you know, make a lot of sense. Come the oceans react to the way they do and don't, you know, it's not necessarily provable, but it's believable.

Gravity is, like he said, it's just a measurement. It's a measurement of how things fall. Right. And that measure. And the word that they invented, gravity, is just an explanation for how objects are pulled downward.