Sources for the timeline include Raymond Kurzweil, The Age of Intelligent Machines (Cambridge, MA: MIT Press, 1990).

Introduction to big bang theory; Joseph Silk, A Short History of the Universe (New York: Scientific American Library, 1994); Joseph Silk, The Big Bang (San Francisco: W. H. Freeman and Company, 1980); Robert M. Wald, Space, Time and Gravity (Chicago: The University of Chicago Press, 1977); Stephen W. Hawking, A Brief History of Time (New York: Bantam Books, 1988).

Evolution and behavior; Edward O. Wilson, The Diversity of Life (New York: W. W. Norton and Company, 1993); Stephen Jay Gould, The Book of Life (New York: W. W. Norton and Company, 1993); Alexander Hellemans and Bryan Bunch, The Timetable of Science (Simon and Schuster, 1988). "CBN History: Radio/Broadcasting Timeline".

"Chronology of Events in the History of Microcomputers".

"The Computer Museum History Center".

1. Picoengineering involves engineering at the level of subatomic particles (e.g., electrons). See note 3 on picoengineering and femtoengineering in chapter 12.

2. Femtoengineering will involve engineering using mechanisms within a quark. See note 3 on picoengineering and femtoengineering in chapter 12.