1 The passage Kurzweil quotes is from Kaczynski's Unabomber Manifesto, which was published jointly, under duress, by The New York Times and The Washington Post to attempt to bring his campaign of terror to an end. I agree with David Gelernter, who said about their decision:

"It was a tough call for the newspapers. To say yes would be giving in to terrorism, and for all they knew he was lying anyway. On the other hand, to say yes might stop the killing. There was also a chance that someone would read the tract and get a hunch about the author; and that is exactly what happened. The suspect's brother read it, and it rang a bell.

"I would have told them not to publish. I'm glad they didn't ask me. I guess."

(Drawing Life: Surviving the Unabomber. Free Press, 1997: 120.)

2 Garrett, Laurie. The Coming Plague: Newly Emerging Diseases in a World Out of Balance. Penguin, 1994: 47-52, 414, 419, 452.

3 Isaac Asimov described what became the most famous view of ethical rules for robot behavior in his book I, Robot in 1950, in his Three Laws of Robotics: 1. A robot may not injure a human being, or, through inaction, allow a human being to come to harm. 2. A robot must obey the orders given it by human beings, except where such orders would conflict with the First Law. 3. A robot must protect its own existence, as long as such protection does not conflict with the First or Second Law.

4 Michelangelo wrote a sonnet that begins:

Non ha l' ottimo artista alcun concetto
Ch' un marmo solo in sè non circonscriva
Col suo soverchio; e solo a quello arriva
La man che ubbidisce all' intelleto.

Stone translates this as:

The best of artists hath no thought to show
which the rough stone in its superfluous shell
doth not include; to break the marble spell
is all the hand that serves the brain can do.

Stone describes the process: "He was not working from his drawings or clay models; they had all been put away. He was carving from the images in his mind. His eyes and hands knew where every line, curve, mass must emerge, and at what depth in the heart of the stone to create the low relief."

(The Agony and the Ecstasy. Doubleday, 1961: 6, 144.)

8 Else, Jon. The Day After Trinity: J. Robert Oppenheimer and The Atomic Bomb (available at www.pyramiddirect.com).

9 This estimate is in Leslie's book The End of the World: The Science and Ethics of Human Extinction, where he notes that the probability of extinction is substantially higher if we accept Brandon Carter's Doomsday Argument, which is, briefly, that "we ought to have some reluctance to believe that we are very exceptionally early, for instance in the earliest 0.001 percent, among all humans who will ever have lived. This would be some reason for thinking that humankind will not survive for many more centuries, let alone colonize the galaxy. Carter's doomsday argument doesn't generate any risk estimates just by itself. It is an argument for revising the estimates which we generate when we consider various possible dangers." (Routledge, 1996: 1, 3, 145.)

10 Clarke, Arthur C. "Presidents, Experts, and Asteroids." Science, June 5, 1998. Reprinted as "Science and Society" in Greetings, Carbon-Based Bipeds! Collected Essays, 1934-1998. St. Martin's Press, 1999: 526.

11 And, as David Forrest suggests in his paper "Regulating Nanotechnology Development," available at www.foresight.org/NanoRev/Forrest1989.html, "If we used strict liability as an alternative to regulation it would be impossible for any developer to internalize the cost of the risk (destruction of the biosphere), so theoretically the activity of developing nanotechnology should never be undertaken." Forrest's analysis leaves us with only government regulation to protect us - not a comforting thought.

12 Meselson, Matthew. "The Problem of Biological Weapons." Presentation to the 1,818th Stated Meeting of the American Academy of Arts and Sciences, January 13, 1999. (minerva.amacad.org/archive/bulletin4.htm)

13 Doty, Paul. "The Forgotten Menace: Nuclear Weapons Stockpiles Still Represent the Biggest Threat to Civilization." Nature, 402, December 9, 1999: 583.

14 See also Hans Bethe's 1997 letter to President Clinton, at www.fas.org/bethecr.htm.

15 Hamilton, Edith. The Greek Way. W. W. Norton & Co., 1942: 35.