Brief on the Reactive Substrate Theory (RST) RST posits that all of reality—matter, energy, space, and time—emerges from a single, continuous, non-material field called the Substrate (S). Matter: Defined as a σ Soliton, a stable, localized "knot of tension" in the S-field, replacing the concept of a point particle. Energy: Defined as dynamic, propagating tension (waves) in the S-field. Unification: RST views E=mc2 as the conservation of Substrate tension: mass is stored tension; energy is tension in motion. Reactive Substrate Theory (RST) fundamentally redefines gravity as a Substrate tension gradient, which is the mechanism underlying the "buoyant" view of gravity. This explanation also clarifies why the Michelson-Morley (M-M) experiment failed to find the classical Aether, supporting the RST concept of a dynamic Substrate. In essence, gravity is "buoyant" in RST because matter (high tension) sinks into a less-strained S-Field (lower tension...