Balter, Michael. 2005. “Expression of Endorphin Gene Favored in Human Evolution. Science  310: 1257.

Berdoy, Manuel, Joanne P.Webster, and D. W.Macdonald. 2000. “Fatal Attraction in Rats Infected with Toxoplasma gondii. Proceedings. Biological Sciences/The Royal Society  267: 1591–94.

Broad, William J.2005. “It's Sensitive. Really. New York Times  (December 13), D1, D4).

The Chimpanzee Sequencing and Analysis Consortium. 2005. “Initial Sequence of the Chimpanzee Genome and Comparison with the Human Genome. Nature  437: 69–87.

Culotta, Elizabeth, and ElizabethPennisi. 2005. “Evolution in Action. Science  310: 1878–79.

Darwin, Charles. [1860] 1952. The Origin of Species  . In Great Books of the Western World, ed. Robert MaynardHutchins and Mortimer J.Adler, vol. 49. Chicago : Encyclopaedia Britannica.

Darwin, Charles. [1871] 1952. The Descent of Man  . In Great Books ofthe Western World, ed. Robert MaynardHutchins and Mortimer J.Adler, vol. 49. Chicago : Encyclopaedia Britannica.

Dial, Kenneth P.2003. “Wing‐Assisted Incline Running and the Evolution of Flight. Science  299: 402–4.

Gilbert, Walter. 1978. “Why Genes in PiecesNature  271: 501.

Goldstein, Avram, Louise I.Lowney, and B. K.Pal. 1971. “Stereospecific and Nonspecific Interactions of the Morphine Congener Levorphanol in Subcellular Fractions of Mouse Brain. Proceedings of the National Academy of Sciences  68 (8): 1742–47.

Hefner, Philip. 2005. “Call for Papers. Zygon: Journal of Religion and Science  40 (December): 798.

Mayr, Ernst. 2001. What Evolution Is. New York : Basic Books.

Miles, Jack. 1995. God: A Biography. New York : Vintage Books.

Pert, Candace B., GavrilPasternak, and Solomon H.Snyder. 1973. “Opiate Agonists and Antagonists. Science (New Series)  182: 1359–61.

Raven, Peter H., George B.Johnson, Jonathan B.Losos, and Susan R.Singer. 2005. Biology. 7th ed. New York : McGraw‐Hill.

Reichlin, Seymour. 1998. “Neurobiology  .”In Williams Textbook of Endocrinology, 9th ed., ed. Jean D.Wilson, Daniel W.Foster, Henry M.Kronenberg, and P. ReedLarsen, 198–99. Philadelphia : W. B. Saunders.

Riddihough, Guy. 2005. “In the Forests of RNA Dark Matter. Science  309: 1507.

Rockman, Matthew V., Matthew W.Hahn, NicoleSoranzo, FritzZimprich, and DavidGoldstein. 2005. “Ancient and Recent Positive Selection Transformed Opioid cis‐Regulation in Humans. Public Library of Science Biology  3 (December): e387 (2208–19).

Shafer, Ingrid H.2005. “The Faust Challenge: Science as Diabolic or Divine. Zygon: Journal of Religion and Science  40 (December): 891–915.

Turner, Ralph. 1941. The Great Cultural Traditions. Vol. I: The Ancient Cities. New York : McGraw‐Hill.

Webster's New World College Dictionary, 4th ed.2002. Cleveland : Wiley.