We propose that the QCD vacuum pion tetrahedron condensate density may vary in space and drop to extremely low values in the Kennan, Barger and Cowie (KBC) void in analogy to earth’s atmospheric density drop with elevation from earth. We propose a formula for the gravitation acceleration based on the non-uniform pion tetrahedron condensate. The MOND acceleration limit may be due to the extremely low pion tetrahedron condensate density at the galaxies’ edges. Gravity may be due to the underlying microscopic attraction between quarks and antiquarks which are part of the vacuum pion tetrahedron condensate. Due to rapid quark exchange reactions between electrons, assumed to be comprised of four quarks and antiquarks, and the pion tetrahedrons, the electrons are delocalized electron clouds. The electrons are comprised of tetraquarks, where the du ̃ quarks determine the electron charge and the d ̃d quarks determine the electron tetraquark spin state. A u ̃u quarks determine the second spin state for the opposite spin electron tetraquark. The major difference between classical and quantum mechanics may be due to the antimatter discovered by Dirac that may be part of the Aether. The central roles of antimatter and the non-uniform QCD vacuum that contains antimatter were not anticipated by general relativity and quantum mechanics. Their roles are not fully understood still and the discovery of the KBC giant voids and the possibility of a non-uniform pion tetrahedron condensate Aether need further study.