101 quantum questions: what you need to know about the world you can't see

The subatomic world --
What is a quantum, anyway? --
Where do the laws of quantum physics hold sway? --
What is the correspondence principle? --
How big is an atom? --
What is inside an atom? --
Why is solid matter solid if it is mostly empty space? --
Digging deeper --
How big is a nucleus? What is inside it? --
How big are protons and neutrons? What is inside them? --
What is Planck\'s constant and what is its significance? --
What is a photon? --
What is the photoelectric effect? --
What particles are believed to be fundamental? --
What particles are composite? --
What is the standard model? --
The small and the swift --
What are some quantum scales of distance? --
How far can one particle \"reach out\" to influence another one? --
How fast do particles move? --
What are some quantum scales of time? --
What is the meaning of E=mc²? --
What is electric charge? --
What is spin? --
Quantum lumps and quantum jumps --
What are some things that are lumpy (and some that are not)? --
What is a \"state of motion\"? --
Is a hydrogen atom in an excited state of motion the same atom in a different state or is it a different atom? --
What are quantum numbers? What are the rules for combining them? --
What is a quantum jump? --
What is the role of probability in quantum physics? --
Is there any certainty in the quantum world? --
Atoms and nuclei --
What is a line spectrum? What does it reveal about atoms? --
Why is the chart of the elements periodic? --
Why are heavy atoms nearly the same size as lightweight atoms? --
How do protons and neutrons move within a nucleus? --
What are atomic number and atomic mass? --
And more about nuclei --
Why does the periodic table end? --
What is radioactivity? What are its forms? --
Why is the neutron stable within a nucleus but unstable when alone? --
What is nuclear fission? Why does it release energy? --
What about nuclear fusion? --
Particles --
What is a leptron? What are its flavors? --
How many distinct neutrinos are there? How do we know? --
Do neutrinos have mass? Why do they \"oscillate\"? --
Are there really only three generations of particles? --
How do we know that all electrons are identical? --
And more particles --
Names, names, names : What do they all mean? --
What are the properties of quarks? How do they combine? --
What are the composite particles? How many are there? --
Does every particle have to be a fermion or a boson? What sets these two classes apart? --
What is a Bose-Einstein condensate? --
How did bosons and fermions get their names? --
Interactions What is a Feynman diagram? What are the essential features of Feynman diagrams? --
How do Feynman diagrams illustrate the strong, weak, and electromagnetic interactions? --
Which particles are stable? Which are unstable? What does it mean to say that a particle decays? --
What is scattering? 
 What is the same before and after a scattering or a decay? --
What changes during a scattering or decay? --
Constancy during change --
What are the \"big four\" absolute conservation laws? --
What additional absolute conservation laws operate in the quantum world? --
What is the TCP theorem? --
What conservation laws are only \"partial\"? --
What symmetry principles are only \"partial\"? --
What are laws of compulsion and of prohibition? --
How are the concepts of symmetry, invariance and conservation related? --
Waves and particles --
What do waves and particles have in common? How do they differ? --
What is the de Broglie equation? What is its significance? --
How are waves related to quantum lumps? --
How do waves relate to the size of atoms? --
What is diffraction? What is interference? --
What is the two-slit experiment? Why is it important? --
What is tunneling? --
Waves and probability --
What is a wave function? What is Schrödinger\'s equation? --
How do waves determine probabilities? --
How do waves prevent particles from having fixed positions? --
What is the uncertainty principle? --
How does the uncertainty principle relate to the wave nature of matter? --
What is superposition? --
Are waves necessary? --
Quantum physics and technology --
How are particles pushed close to the speed of light? --
How are high-energy particles detected? --
How does a laser work? --
How do electrons behave in a metal? --
What is a semiconductor? --
What is a p-n junction? Why is it a diode? --
What are some uses of diodes? --
What is a transistor? --
Quantum physics at every scale --
Why do black holes evaporate? How does quantum physics operate in the center of the Sun? --

 What is superconductivity? --
What is superfluidity? --
What is a Josephson junction? --
What is a quantum dot? --
What is a quark-gluon plasma? --
What is the Planck length? What is quantum foam? --
Frontiers and puzzles --
Why are physicists in love with the number 137? --
What is entanglement? --
What is Bell\'s inequality? --
What is a qubit? What is quantum computing? --
What is the Higgs particle? Why is it important? --
What is string theory? --
What is the \"measurement problem\"? --
How come the quantum?