What is the origin of mass? Does the Higgs particle exist? How can the mass of physical particles be completely explained based on the masses of the quarks? Are there additional generations of quarks and leptons? What are the masses of the neutrinos? Could a neutrino be its own antiparticle? How can the gravitational interaction be incorporated into particle physics theories? Are supersymmetry and string theory able to replace the Standard Model? Perhaps you will be able to find the answers to these and other questions.