I. Dimensions of space (and thought)
1. Entryway passages : demystifying dimensions
2. Restricted passages : rolled-up extra dimensions
3. Exclusive passages : branes, braneworlds, and the bulk
4. Approaches to theoretical physics
II. Early twentieth-century advances
5. Relativity : the evolution of Einstein's gravity
6. Quantum mechanics : principled uncertainty, the principal uncertainties, and the uncertainty principle
III. physics of elementary particles
7. standard model of particle physics : matter's most basic known structure
8. Experimental interlude : verifying the standard model
9. Symmetry : the essential organizing principle
10. origin of elementary particle masses : spontaneous symmetry breaking and the Higgs mechanism
11. Scaling and grand unification : relating interactions at different lengths and energies
12. hierarchy problem : the only effective trickle-down theory
13. Supersymmetry : a leap beyond the standard model
IV. String theory and branes
14. Allegro (Ma Non Troppo) passage for strings
15. Supporting passages : brane development
16. Bustling passages : braneworlds
V. Proposals for extra-dimensional universes
17. Sparsely populated passages : multiverses and sequestering
18. Leaky passages : fingerprints of extra dimensions
19. Voluminous passages : large extra dimensions
20. Warped passage : a solution to the hierarchy problem
21. warped annotated "Alice"
22. Profound passage : an infinite extra dimension
23. reflective and expansive passage
24. Extra dimensions : are you in or out?
