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Alvarez, Walter, and Frank Asaro. "What Caused the Mass Extinction? An Extraterrestrial Impact." Scientific American, October 1990, p. 78;

Courtillot, Vincent E. "What Caused the Mass Extinction? A Volcanic Eruption." Scientific American, p. 85. Two papers that debate the event that resulted in a mass extinction 65 million years ago.

Cronin, J. E., N. T. Boaz, C. B. Stringer, and Y. Rak. "Tempo and Mode in Hominid Evolution." Nature, 292, pp. 113–22, 1981.

Farrington, Benjamin. What Darwin Really Said. Schocken Books, New York, 1966.

Gillespie, John H. The Causes of Molecular Evolution. Oxford University Press, New York, 1991.

Gould, Stephen Jay. Dinosaur in a Haystack: Reflections in Natural History. Harmony Books, New York, 1995. More of Gould’s essays originally published in Natural History magazine.

Mangelsdorf, Paul C. "The Origin of Corn." Scientific American, August 1986, p. 80. Modern corn, the author argues, had not one ancestor but two: It is derived from a cross between a primitive corn and a perennial form of the wild grass teosinte.

Sheppard, P. M. Natural Selection and Heredity, 4th ed. Hutchinson and Co., London, 1975.

Stanley, Steven M. "Mass Extinctions in the Ocean." Scientific American, June 1984, p. 64. During brief intervals over the past 700 million years, many marine animals and plants have died out. Geologic evidence now suggests that most of the mass extinctions were caused by cooling of the sea.

Stebbins, G. Ledyard, and Francisco J. Ayala. "The Evolution of Darwinism." Scientific American, July 1985, p. 72. Recent developments in molecular biology and new interpretations of the fossil record are gradually altering and adding to the synthetic theory of evolution.

Weiner, Jonathan. The Beak of the Finch: Evolution in Our Time. Alfred E. Knopf, New York, 1994. A superb exposition of contemporary research on evolution, centering on the Grants’ work on the Galápagos finches.

Zimmer, Carl. "Hypersea Invasion." Discover, October 1995, p. 76. Paleontologists Mark and Dianna McMenamin explain the mystery of how life on land spawned much more diversity than life in the sea in much less time, by viewing the fluids within the whole of land life as one interconnected "hypersea."

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