References

[1] R. Kurzweil, The Age of Spiritual Machines, (Penguin Books, New York, 1999), page 140.

[2] K. E. Drexler, Engines of Creation, (Anchor Books, New York, 1986), page 49.

[4] R. Feynman, "There's plenty of room at the bottom", in Miniaturization, edited by H.D. Gilbert (Reinhold, New York, 1961).

[5] Reprinted with permission from D.W. Carr et al, Appl. Phy. Lett. 75, 920 (1999). Copyright 1999. American Institute of Physics.

[6] Reprinted with permission from Nature: P. Ball, Nature 406, 118-120(2000). Copyright 2000. Macmillan Publishers Ltd.

[8] Reprinted with permission from

C.W. Warren & N. Shumig, Science 281, 2016-2018(1998). Copyright 1998 AAAS.

[9] Courtesy G.A. Prinz, U.S. Naval Research Laboratory, Washington, DC.

[10] These filters are manufactured by Nuclepore Corporation, 7035 Commerce Circle, Plea-santon, CA 94566.

[11] G.P.Crawford, L.M. Steele, R. Ondris-Crawford, G. S. Iannocchione, C. J. Yeager, J. W. Doane, and D. Finotello,}. Chem. Phys. 96, 7788(1992).

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