This document presents a unified theory of electromagnetism and gravity, proposing that particle masses originate from their substructures rather than a Higgs mechanism, thus resolving fundamental mysteries in physics. It introduces a 'particle femtoscope' for analyzing these substructures and predicts particle masses with precision using simple arithmetic formulas. The findings extend to explaining dark matter and energy, asserting they arise from interactions in a dual universe framework, ultimately advancing our understanding of mass in the universe.