We live in interesting times. We have a theory of strong, weak, and electromagnetic interactions. Many new accelerators are being built to test this theory. Unlike previous inventions, Quantum Chromodynamics (QCD) is a true theory of strong interactions. It is a fundamental theory, like Newton's or Maxwell's, and may be correct. It is the first real theory of strong interactions since the meson theory. The meson theory considered protons and neutrons as fundamental particles, but they are not. Modern physics has shown that protons are made of quarks. We now have a theory with quarks as fundamental matter fields and gluons as force fields. We also have a theory of weak interactions that is correct and predictive. Many accelerators are under construction to study b-matter, weak intermediaries, and possibly find the t-quark and Higgs boson. The strong, weak, and electromagnetic interactions are deduced from a conjectured exact local symmetry group. The minimal gauge group needed to describe known phenomena is H₁ = SU(3) × SU(2) × U(1). Spontaneous symmetry breaking is key, achieved through Higgs bosons. The surviving subgroup is H₀ = SU(3) × U(1). These assignments are tentative. There may be other structures or symmetries. Color and electric charge are exactly conserved due to local symmetries. These are like momentum, energy, and angular momentum. The twelve gauge bosons of H₁ include eight gluons, three weak intermediaries, and the photon. The weak intermediaries acquire mass through Higgs mesons. The successful prediction cosθ = Mw/Mz has been tested. At least one Higgs meson must exist with a mass between 10 GeV and several hundred GeV. Five parameters describe the system: three gauge coupling constants, and Higgs self-couplings.We live in interesting times. We have a theory of strong, weak, and electromagnetic interactions. Many new accelerators are being built to test this theory. Unlike previous inventions, Quantum Chromodynamics (QCD) is a true theory of strong interactions. It is a fundamental theory, like Newton's or Maxwell's, and may be correct. It is the first real theory of strong interactions since the meson theory. The meson theory considered protons and neutrons as fundamental particles, but they are not. Modern physics has shown that protons are made of quarks. We now have a theory with quarks as fundamental matter fields and gluons as force fields. We also have a theory of weak interactions that is correct and predictive. Many accelerators are under construction to study b-matter, weak intermediaries, and possibly find the t-quark and Higgs boson. The strong, weak, and electromagnetic interactions are deduced from a conjectured exact local symmetry group. The minimal gauge group needed to describe known phenomena is H₁ = SU(3) × SU(2) × U(1). Spontaneous symmetry breaking is key, achieved through Higgs bosons. The surviving subgroup is H₀ = SU(3) × U(1). These assignments are tentative. There may be other structures or symmetries. Color and electric charge are exactly conserved due to local symmetries. These are like momentum, energy, and angular momentum. The twelve gauge bosons of H₁ include eight gluons, three weak intermediaries, and the photon. The weak intermediaries acquire mass through Higgs mesons. The successful prediction cosθ = Mw/Mz has been tested. At least one Higgs meson must exist with a mass between 10 GeV and several hundred GeV. Five parameters describe the system: three gauge coupling constants, and Higgs self-couplings.