Besides the residual heat of formation and the continued heat generated by the Earth's continued contraction (so-called "primordial heat"), the slow decay of radioactive nuclides (so-called "radiogenic heat") both contribute (in roughly equal proportions) to the Earth's internal heat budget, estimated at 47±2 terawatts (TW).
Tidal forces (resulting in friction and, thus, heat) also make a contribution, though I don't know off hand how this heat is classified (it certainly isn't "radiogenic heat," but then it really isn't "primordial heat," either - I suppose that it should be classified as "external heat," together with the 173,000 TW of incoming solar radiation).
U-235 is just a single radionuclide. There are many other naturally occurring radionuclides that make significant contributions to the Earth's internal heat budget.
Regards,
I like your tag line, by the way. It’s my favorite catch phrase when dealing with conspiracy theories. I do believe there are conspiracies, I just don’t believe in mass conspiracies. Ones involving thousands or millions of people.