Page 216: The Seven sleepers

Page 219: The forty-two 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 six-ness 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 source-book edited by Stephen Hawking, God Created the Integers: The Mathematical Breakthroughs That Changed History