Contents -- Introduction -- I. The Subatomic World -- 1. What is a quantum, anyway? -- 2. Where do the laws of quantum physics hold sway? -- 3. What is the correspondence principle? -- 4. How big is an atom? -- 5. What is inside an atom? -- 6. Why is solid matter solid if it is mostly empty space? -- 7. How big is an electron? Is there anything inside it? -- II. Digging Deeper -- 8. How big is a nucleus? What is inside it? -- 9. How big are protons and neutrons? What is inside them? -- 10. What is Planck's constant and what is its significance? -- 11. What is a photon? -- 12. What is the photoelectric effect? -- 13. What particles are believed to be fundamental? What particles are composite? -- 14. What is the standard model? -- III. The Small and the Swift -- 15. What are some quantum scales of distance? -- 16. How far can one particle "reach out" to influence another one? -- 17. How fast do particles move? -- 18. What are some quantum scales of time? -- 19. What is the meaning of E=mc2? -- 20. What is electric charge? -- 21. What is spin? -- IV. Quantum Lumps and Quantum Jumps -- 22. What are some things that are lumpy (and some that are not)? -- 23. What is a "state of motion"? -- 24. Is a hydrogen atom in an excited state of motion the same atom in a different state or is it a different atom? -- 25. What are quantum numbers? What are the rules for combining them? -- 26. What is a quantum jump? -- 27. What is the role of probability in quantum physics? -- 28. Is there any certainty in the quantum world? -- V. Atoms and Nuclei -- 29. What is a line spectrum? What does it reveal about atoms? -- 30. Why is the chart of the elements periodic? -- 31. Why are heavy atoms nearly the same size as lightweight atoms? -- 32. How do protons and neutrons move within a nucleus? -- 33. What are atomic number and atomic mass? -- VI. And More about Nuclei.

34. Why does the periodic table end? -- 35. What is radioactivity? What are its forms? -- 36. Why is the neutron stable within a nucleus but unstable when alone? -- 37. What is nuclear fission? Why does it release energy? -- 38. What about nuclear fussion? -- VII. Particles -- 39. What is a lepton? What are its flavors? -- 40. How many distinct neutrinos are there? How do we know? -- 41. Do neutrinos have mass? Why do they "oscillate"? -- 42. Are there really only three generations of particles? -- 43. How do we know that all electrons are identical? -- VIII. And More Particles -- 44. Names, names, names. What do they all mean? -- 45. What are the properties of quarks? How do they combine? -- 46. What are the composite particles? How many are there? -- 47. Does every particle have to be a fermion or a boson? What sets these two classes apart? -- 48. What is a Boss-Einstein condensate? -- 49. How did bosons and fermions get their names? -- IX. Interactions -- 50. What is a Feynman diagram? -- 51. What are the essential features of Feynman diagrams? -- 52. How do Feynman diagrams illustrate the strong, weak, and electromagnetic interactions? -- 53. Which particles are stable? Which are unstable? What does it mean to say that a particle decays? -- 54. What is scattering? -- 55. What is the same before and after a scattering or a decay? -- 56. What changes during a scattering or decay? -- X. Constancy during Change -- 57. What are the "big four" absolute conservation laws? -- 58. What additional absolute conservation laws operate in the quantum world? -- 59. What is the TCP theorem? -- 60. What conservation laws are only "partial"? -- 61. What symmetry principles are only "partial"? -- 62. What are laws of compulsion and of prohibition? -- 63. How are the concepts of symmetry, invariance, and conservation related? -- XI. Waves and Particles.

64. What do waves and particles have in common? How do they differ? -- 65. What is the de Broglie equation? What is its significance? -- 66. How are waves related to quantum lumps? -- 67. How do waves relate to the size of atoms? -- 68. What is diffraction? What is interference? -- 69. What is the two-slit experiment? Why is it important? -- 70. What is tunneling? -- XII. Waves and Probability -- 71. What is a wave function? What is Schrödinger's equation? -- 72. How do waves determine probabilities? -- 73. How do waves prevent particles from having fixed positions? -- 74. What is the uncertainty principle? -- 75. How does the uncertainty principle relate to the wave nature of matter? -- 76. What is superposition? -- 77. Are waves necessary? -- XIII. Quantum Physics and Technology -- 78. How are particles pushed close to the speed of light? -- 79. How are high-energy particles detected? -- 80. How does a laser work? -- 81. How do electrons behave in a metal? -- 82. What is a semiconductor? -- 83. What is a p-n junction? Why is it a diode? -- 84. What are some uses of diodes? -- 85. What is a transitor? -- XIV. Quantum Physics at Every Scale -- 86. Why do black holes evaporate? -- 87. How does quantum physics operate in the center of the Sun? -- 88. What is superconductivity? -- 89. What is superfluidity? -- 90. What is a Josephson junction? -- 91. What is a quantum dot? -- 92. What is quark-gluon plasma? -- 93. What is the Planck length? What is quantum foam? -- XV. Frontiers and Puzzles -- 94. Why are physicists in love with the number 137? -- 95. What is entanglement? -- 96. What is Bell's inequality? -- 97. What is a qubit? What is quantum computing? -- 98. What is the Higgs particle? Why is it important? -- 99. What is string theory? -- 100. What is the "measurement problem"? -- 101. How come the quantum? -- Appendix A -- Appendix B.

Acknowledgments -- Index.