Page 215: Text of Through the LookingGlass
Page 216: The Seven sleepers
Page 219: The fortytwo generations
Page 224: Planck's introduction of the quantum of action in 1899
Page 225: Simon Plouffe is one of many mathematicians who has looked for convincing explanations of the mysterious constants of nature: here he proposes a formula for the mass ratio of the neutron and the proton.
Page 222: Martin J. Rees, Just Six Numbers: the deep forces that shape the universe
Page 224: Simon Singh's series on numbers counts Newton's constant of gravitation as a number.
Page 229: John D. Barrow and Frank J. Tipler, The Anthropic Cosmological Principle
Page 223: A concise picture of the sixness of the standard model
Page 229: A session of the United Deities by the humorist Miles Kington (who died in 2008).
Page 236: Roger Penrose, The Road to Reality: A Complete Guide to the Laws of the Universe
Page 237: There is a translation of Archimedes' work, along with many other gems, in the sourcebook edited by Stephen Hawking, God Created the Integers: The Mathematical Breakthroughs That Changed History
