We know that within the Standard Model (SM) we still (since 1964) cannot calculate exact masses and spin of proton and neutron from initial conditions, whereas the Cosmological Standard Model (CSM) that involves the General Theory of Relativity (GR) and Quantum Physics (QP) does not lead to origin of the dark matter and dark energy. Moreover, within the leading mainstream theories we cannot derive physical constants and mathematical constants applied in physics from initial conditions the GR and QP start from. There as well are tens of unsolved basic problems, for example, what mechanism causes that neutrinos acquire their masses or why the energy distance/gap between the Planck scale and the electric-charges scale is tremendous. It suggests that the leading mainstream theories are incomplete. Just there must be in existence some lacking part of the Theory of Everything (ToE) more fundamental than GR and QP. We suggest that the Scale-Symmetric Theory (SST) is the lacking part of ToE. What is the SST? The GR leads to the superluminal non-gravitating Higgs field composed of tachyons. On the other hand, the SST shows that the succeeding phase transitions of such Higgs field lead to the theories of different scales of sizes/energies that solve all unsolved basic problems in particle physics and cosmology. Here is a very short recapitulation concerning the basic problems solved within SST that are not solved or are described incorrectly within the mainstream theories: The equivalence of pure energy and gravitational mass; Wrong interpretation of the Michelson-Morley experiment that follows from the quantum entanglement; The illusion of acceleration of expansion of the Universe; Non-existence of luminal gravitational waves; Why the Cosmos did not collapse at the beginning of the big bang?; Where is the antimatter ?; Why the Universe is flat ?; The hierarchy problem; The origin of dark matter; The many-worlds interpretation within QP; The 3-valence-quarks model of baryons; Why QED gives good results in spite of neglecting the weak interactions of electrons ?; Can the flexible closed strings applied in the M/string theory lead to invariance of gravitational constant ?; What is the origin of DNA?