1. Introduction.- 2. Beyond the Ether.- 3. Introduction to Quantum Mechanics.- 4. Analysis of the Photoelectric Effect.- 5. De Broglie and Electron Waves.- 5.1. Amplitude, Phase, and Interference.- 6. The Wave Function and Feynman’s Two-Slit Experiment.- 7. The Pauli Exclusion Principle: the Identity of Particles.- 8. The Schrodinger Wave Equation and the Hydrogen Atom.- 9. Critique of the Pointlike Electron.- 10. Complementary Attributes and the Uncertainty Principle.- 11. An Illustration: Polarized Light.- 12. Heisenberg and Measurement.- 13. More on Measurement.- 14. Further Reflections on the Bohr-Peierls Interpretation.- 15. Toward the Dirac Viewpoint.- 15.1. The Dirac Version.- 16. Feynman’s Path Integral Method.- 17. Are Fields All?.- 18. A Visit with Photons: Identity and Flexibility.- 19. Can Wave Packets Be Particles?.- 20. The Quantum Stellar Interferometer of Hanbury Brown.- 21. About the Delayed-Choice Experiment.- 22. The Illusion of Superluminal Signaling.- 22.1. Davies’ “Split Box” and Wave Function Collapse.- 22.2. The Modified EPR Experiment with Photons.- 23. The Meaning of Bell’s Theorem.- 24. Symmetry and Point Particles.- 25. The Quantum Mechanics of Multiparticle Systems.- 26. Atoms, Molecules, and the Periodic Table.- 27. Chemists, Pictures, and Molecular Architecture.- 28. Carbon and the Structure of Organic Molecules.- 29. Quantum Behavior in Macroscopic Systems: Beyond Wave Functions.- 29.1. Elementary Excitations as Quanta.- 30. More on Phases: The Effect of Magnetic Fields.- 31. Macroscopic Quantum Phenomena.- 31.1. Laser Light.- 31.2. Superconductors.- 31.3. Superfluid Liquid Helium.- 32. Collective Oscillations in Solids.- 33. Beyond the Frontier: Nonclassical Properties.- 34. Some Reflections on “Reality”.- 35. Reality and Other Sciences.- 36. A Final Perspective.