Excellent content. Thanks! Correction FYI: at 05'30" you confused the value for the vacuum permittivity (8.854E-12) with coulomb's constant (9E+9). FWIW, In trying to comprehend gravity, I used to find it helpful to use the invented term I called "heightage" as an analogue of voltage. And I've often pondered the notion of 'big G' being the result of a hidden gravitational equivalent of permeability or permittivity i.e., a kind of "gravitational-ivity"; imagine a time or place in the universe where gravitation behaved differently because the local value of "gravibility" or "gravitivity" was different from what is baked into our measurement of G!