Things to make and do in the fourth dimension : a mathematician's journey through narcissistic numbers, optimal dating algorithms, at least two kinds of infinity, and more

The shape of inner space : string theory and the geometry of the universe's hidden dimensions

The day we found the universe

Hiding in the mirror : the quest for alternate realities, from Plato to string theory (by way of Alice in Wonderland, Einstein, and The twilight zone)

Hyperspace : a scientific Odyssey through paralled universes, time warps, and the tenth dimension