CONTENTS -- Preface -- The Weak Interaction: Its History and Impact on Physics -- 1. Classical Period (B Decay) -- 2. Classical Period (Other Weak Interactions) -- 3. Transition Period (1949-1956) -- 4. New Horizon In The Transition Period -- 5. The Breakthrough (1956) -- 6. Symmetry Violations -- 7. Time Reversal -- 8. Present Status -- 9. Physical Vacuum -- 10. Phase Diagram Of The QCD Vacuum -- 11. ππ-Interferometry -- 12. Concluding Remarks -- References -- Electron Orbits and Superconductivity of Carbon 60 -- 1. Introduction -- 2. Icosahedral Group -- 3. C60 -- 4. Pairing Mechanism -- 5. K3 C60 -- References -- The Power of Duality - Exact Results in 4D SUSY Field Theory -- 1. Introduction -- 2. Duality in electrodynamics -- 3. The Dynamics of Supersymmetric Field Theories -- 4. Results - duality in non-Abelian theories -- 5. Conclusions -- References -- String Theory as a Universal Language -- Abstract -- 1 Introduction -- 2 The image of gluons and zigzag symmetry -- 3 The D-brane picture -- 4 Conformal gauge theories in higher dimensions -- 5 Infrared screening of the cosmological constant and other speculations -- References -- The Cosmological Tests -- 1. Introduction -- 2. The Classical Tests -- 3. The Paradigm Shift to Low Mass Density -- 4. Issues of Structure Formation -- 5. Concluding Remarks -- References -- Anti-de Sitter Space, Thermal Phase Transition and Confinement in Gauge Theories -- 1. Introduction -- 2. High Temperatures And AdS Black Holes -- 3. High Temperature Behavior Of The N = 4 Theory -- 4. Approach To QCD -- References -- Can There be Physics Without Experiments? Challenges and Pitfalls -- Summary -- Introduction -- Theory and Experiment in Physics -- Examples from the past -- References.