By: Brian Greene read in 2000

185 Kaluza and extra dimensions
187 Two types of spatial dimensions: extended and curled
187 The question of "seeing" extra dimensions.
307 "contact with 4 dimensions" accomplished a la Kaluza-Klein
317 Criteria for being able to observe higher dimensional objects
318 "precisely three extended spatial dimensions"
408 The possibility that our universe is a 3-brane; a 3-dimensional manifold in a higher space
377 Leibniz: "Why is there something and not nothing?"