From the Archives: Ralph Spitzer, TD Lysenko, and the Left-Wing Attack on Science

In any culture-war debate these days, we can count on a few predictable ideological combinations.  The conservative/traditional/Right side will fight for freer markets, smaller government, more patriotism, more traditional social mores, and greater public Christianity.  The progressive/liberal/Left side will fight for greater egalitarianism, more robust government, and multiculturalism.

One of the other relatively consistent ideological markers these days seems to be an attitude toward science.  Conservatives, whether they like it or not, are now the side of anti-science.  Whether it is evolution or human-caused climate change, the Right is now the side that is skeptical of the claims of mainstream science.  Of course, as with any issue in this culture-war minefield, we need to be careful to note that this does not mean that these culture warriors are necessarily against science as such.  Rather, many conservatives will adopt an attitude of profound skepticism toward the directions in which mainstream research-university-based science research has gone.  REAL science, they might insist, will confirm their claims.  But ‘science falsely so called,’ in the minds of many cultural conservatives, has come to dominate the academy and academic press.  They are not anti-science, these conservatives might insist, only anti-false science. To the person on the street, though, it is easy to conclude that the Right is the side that always opposes science.

During a recent stint with some 1940s newspapers, I came across a story that complicates those comfortable assumptions.  Ralph Spitzer’s story is a good reminder of the reasons why we need to keep these storylines complicated.  It points out the danger of assuming any necessary relationship between science and politics.  Spitzer was fired from his teaching job at Oregon State College (now Oregon State University) in 1949 for his political beliefs.  At the time, he joined a swelling number of higher-education faculty who had lost their jobs for affiliation with Communist- or purportedly “Communist-front” organizations.

But unlike Joseph Butterworth, Herbert J. Phillips, and Ralph H. Gundlach, all fired from the University of Washington for their Communist Party membership or sympathy, Spitzer was also fired for his opposition to mainstream science.

Oregon State President August Strand accused Spitzer of betraying not only America, but also science.  Strand alleged that Spitzer’s public comments in favor of the prominent Soviet scientist TD Lysenko pushed Spitzer outside the range of legitimate scientific discussion.  By endorsing Lysenko, Strand accused, Spitzer had denounced the mainstream science of genetics and natural selection.  Thus, Spitzer was fired not only for being a communist sympathizer, but for being a sympathizer of communist anti-science.

Historian David Joravsky has argued that the popular understanding of Lysenko’s argument has become something of a durable myth.  Most people remember Lysenko’s scientific regime, if they remember it at all, as an ideological attack on genetics.  According to Joravsky, some have remembered Lysenkoism as an attack on the capitalist assumptions of genetics.  This myth presents Lysenko as a totalitarian ideologue, refusing to acknowledge the truth of genetics, due to mental blocks derived from Stalinism.  Humans, according to the Lysenko myth, must remain malleable in nature.  They must be able to form themselves into new beings, pushing a neo-Lamarckian understanding of human heredity to the fore.  In other words, according this Lysenko myth, humans must not have heritable DNA, since we know from Marxism/Leninism/Stalinism that humans can be recreated by new conditions.  Changes made in one lifetime can be passed on to future generations.

According to Joravsky, the truth of the Lysenko affair was far less ideological.  In Joravsky’s reading, the real thing was not theoretical or even political, except in the grubbiest of senses.  “Not only genetics but all the sciences that impinge on agriculture were tyrannically abused by quacks and time-servers for about thirty-five years,” Joravsky argued.   This was not done out of an ideological demand that humans be understood to be perfectable, but only because of a “self-deceiving arrogance among political bosses.”  The whole thing was mainly “brutal irrationality in the campaign for improved farming.”

In 1948, the Soviet scientific establishment, after long years of back and forth debate between anti-Mendelian Lysenkoists and modern geneticists, finally prohibited the science of genetics altogether.  This was the decision that Spitzer lamely defended.

Before we look at Spitzer’s defense, however, we need to take a closer look at the Lysenkoist vision of science.  What did Lysenko himself say?

Lysenko in 1935 gained control over the new science of agrobiology.  He engaged in a series of big new programs.  Each suggested a quick agricultural fix, such as a way to plant wheat in cold and arid areas, or to grow potatoes in warmer climes.  Instead of becoming implicated in the inevitable failure of these panaceas, Lysenko moved on in each case to identify himself with a new type of problem and quick solution.  Those who demurred from his over-optimistic and unscientific solutions were in danger of being labeled “wreckers” for their anti-Soviet pessimism.

By 1945, Lysenko insisted that plants such as oaks would thin themselves.  Out of community feeling, Lysenko argued, the weakest would kill themselves.   Thus, no thinning by hand was required.  This notion effectively repudiated the modern notion of natural selection.  It embraced a thoroughly unmodern notion that organisms would pass along inherited attributes, a notion usually referred to as “Lamarckism.”  In this case, Lysenko and his disciples argued, in effect, that the inherited characteristics of plants and animals could be radically changed by changes in their environment.  Most famously, Lysenkoites insisted that rye could grow on wheat plants, given the right environment.  This could, Lysenko’s disciples insisted, instantly increase agricultural yields in cold, dry climates.  Furthermore, Lysenkoite science insisted that the fellow-feeling among oak trees allowed for a massive planting policy.  Peasants could scatter acorns and let the resulting clusters of oak trees thin themselves.  With very little cost, this policy would lead to a massive forestation of the Russian steppe, turning its dry cold climate into a moist, warm one.  Such grandiose promises made modern scientists nervous.  They did not see the evidence on which these claims were based, because in Lysenkoist science no such evidence was required.

Lysenko’s Soviet approach to science was not the idiosyncratic tyranny that some have taken it for.  It grew out of a long Russian tradition of skepticism toward European culture in general.  Like the nineteenth-century Panslavists, some Russian chauvinists, before and after the 1917 Revolution, insisted that Western culture, including Western science, did not fit the Russian or Soviet world.

For example, before the Revolution, soil scientist SK Bogushevski denounced western methods of science as inapplicable to Russia.  As with American creationists, this kind of Russian anti-science did not generally denounce the idea of science.  Rather, as with the “anti-scientists” in twentieth-century American conservative circles, Russian and Soviet anti-scientists denounced mainstream science as misguided.

For example, in the early Soviet era, President Kalinin of the Agricultural Institute told his faculty, “There must be barbarism so that, from this soil, democratic, simple science can emerge.”  Similarly, in an early telegram to Lenin, Stalin articulated a vision of an alternate, superior version of science.  Stalin had insisted the Navy attack a fortress.  Naval experts pooh-poohed the plan.  But it worked.  And after it worked, Stalin wrote, “The naval specialists declare that taking [the fortress] by sea subverts naval science.  All I can do is bemoan so-called science.”  This kind of attitude toward science—that the nominal scientific experts really did not know what they were doing—sounds very similar to the kind of science promoted by Biblical creationists in twentieth-century America.  Of course, the preferred model of science was different for American creationists than it was for Stalinist Lysenkoists.  For Biblical creationists, real science derives from Scripture.  For Soviet or Russian ideologues, real science derives from chauvinist Russian or Soviet ideology.  Having pure, correct science, in this view, did not mean deriving it from religious sources, but rather from indigenous Russian peasant wisdom.

Throughout his career, Lysenko called his version of science “Michurinism.”  Michurin had been an agricultural outsider, a fruit-tree breeder with distinctly original and anti-scientific ideas about science and agriculture.  His popularity resulted largely from his aggressive style.  In 1930 a Bolshevik literary magazine (October) promoted Michurin as a “people’s” scientist: the editors declared the needed goal to “Michurinize” the country:

to knock out sleepiness with punches, with demands, with insistence, with daring.  With daring to master and transform the earth, nature, fruit.  Is it not daring to drive the grape into the tundra!  Drive!  Drive!  Drive! Into the furrows, into the gardens, into the orchards, into the machines of jelly factories. . . .  Faster and faster, . . . faster comrade agronomists!

Clearly, this isn’t much of a scientific argument.  Nevertheless, it WAS a powerful cultural argument about science and the nature of science.  Outside of scientific circles, and outside of the Soviet Union’s sphere of influence, this departure from mainstream science did not win a lot of support.  But it did convince one cultural A-lister.  In 1951, Bertholt Brecht composed a long, remarkable poem in celebration of Lysenko’s anti-science.  (Thanks to Robert C. Conrad and Ralph Ley who translated it into English in Autumn, 1976 issue of New German Critique, pp. 142-152).          “The Rearing of Millet” lionized Lysenkoite science as the true Soviet science.  It made heroes of peasants in their pre-scientific “hut labs,” exploring ways to leapfrog over Western agricultural science with Soviet zeal and Stakhanovite exertion.  A few stanzas will suffice to convey the poem’s flavor:

It was ten times that of previous years.

All winter, huddled around the oven’s fire

They praised in the village Berziyev’s millet seed.

But the old man thought only of an even better kind.

Dream the golden if!                                        

See the beautiful sea of millet rise!

Sower, know

That they are already one: tomorrow’s deed and today’s surmise!

…. So let us always with newer skills

Change this earth’s effect and form

Happily measuring thousand-year-old wisdom

With the new wisdom one year old.

Dream the golden if!

See the beautiful sea of millet rise!

Sower, know

That they are one: tomorrow’s deed and today’s surmise!

Clearly, for Brecht as for much of the Soviet scientific establishment, something was going on beyond the boundaries of modern scientific endeavor.  A portion of Soviet scientists embraced “Michurinism” as science, not for scientific reasons, but for either pragmatic political considerations or excessive ideological zeal.  They dreamed that they could overthrow accepted scientific “wisdom/ With the new wisdom one year old.”

To be fair, these reasons did not get far outside of the zone of Soviet influence.  Not even Ralph Spitzer supported this kind of Soviet science.  Nor did Spitzer actually denounce modern genetics or the idea of natural selection.  Spitzer was not a geneticist or an agronomist.  Rather, he was a chemist, and his damning support for Lysenkoism came in a letter he wrote to Chemical and Engineering News.  In his letter, Spitzer took issue with an article that had dismissed Lysenko’s claims to superior science.  Spitzer contended that the Soviet Union’s Party control over science did not differ in essential ways from the financial control of basic research in the capitalist world.  In both systems, Spitzer argued, only that research could be conducted that won the support of influential higher-ups in the establishment.

In addition to Spitzer’s and Spitzer’s wife activism in favor of Progressive Party candidate Henry Wallace, this moderate level of support for Lysenko was enough for President Strand.  “I do not deny the right under the law to work for the Communist Party,” Strand conceded in a public statement after the firing, “but I do claim that the administration of the college has the right to terminate an annual contract.  We do not care to have Dr. Spitzer as a permanent part of the staff!”

For Strand, the issue was not one of science vs. anti-science, but rather Americanism vs. Communism.  Spitzer’s sin was not that he clung to an alternative notion of science, but rather that he defended the legitimacy of the Soviet method of funding science.

Beyond the sad result for Spitzer’s career, this brush with Lysenkoism in the American academy should be of interest to everyone interested in America’s creation/evolution debate.  There are at least four notable parallels between Soviet and American anti-science.

First of all, the crux of the Lysenko Affair, according to David Joravsky, was that between roughly 1935 and 1965, Soviet scientists could not safely dispute the scientific truth of the official ideological line.  Thus, Stalin’s nod of support in favor of Michurinism meant that all Soviet scientists who wanted to continue working had to at least offer lip service to the scientific truths of Lysenko’s ideas.

The outrage to mainstream scientists, in the cases of both Lysenkoism and American Biblical creationism, is that a political or religious source is given primacy over scientific discoveries.  For American creationists, the Bible lays down the orthodox line.  Whatever does not agree with it must not be scientifically true.  For Soviet scientists, especially in the high period of Lysenkoite influence between 1948 and 1952, whatever disagreed with Lysenko could not be officially recognized as scientifically legitimate.

Another intriguing similarity is the use of scientific-sounding language to buttress claims of scientific legitimacy by both Lysenko and Biblical creationists.  Lysenko famously used language that Soviet scientists found maddeningly vague.  He refused to offer scientifically valid evidence for his claims.  In its place, he dished out rhetorical gems such as the following:

The work of the Institute of Plant Breeding and Genetics (Odessa) is based precisely on the established facts of such an absolutely definite sequentiality of the connection of the development of the hereditary base in stages, and of the latter in organs and characters. . . .

These solitary bottlenecks will be overcome in the process of segregation of the heterozygote by means of a mutual replacement of the bad index of one form by the analogous good index of the second, and conversely.

Non-scientists can be forgiven for finding these kinds of sentences meaningless.  However, trained scientists also found them to be nothing but fluff.  Critics of American Biblical creationism make the same charge against the science-like rhetoric of prominent creationists.  In a recent article defending the notion that complex organs imply intelligent design, Jerry Bergman employed some scientific-sounding rhetoric:

Likewise, the left RLN has a different anatomical trajectory than one would first expect, and for very good reasons.  In contrast to [paleontologist Donald] Prothero’s claim, the vagus nerve (the longest of the cranial nerves) travels from the neck down toward the heart, and then the recurrent laryngeal nerve branches off from the vagus just below the aorta (the largest artery in the body, originating from the left ventricle of the heart and extending down the abdomen). The RLN travels upward to serve several organs, some near where it branches off of the vagus nerve, and then travels back up to the larynx.

I’m not commenting here on the validity of Bergman’s claims.  But I do want to point out that modern American Biblical creationists value this kind of tone, a clinical authorial voice that implies a thorough mastery of the latest in mainstream science.  Whenever mainstream scientists examine the scientific validity of such claims, however, they invariably conclude that there is no real science behind them.

Third, both Lysenko and American creationists tend at times to belittle the academic nature of mainstream science.  Lysenko argued that mainstream science did not care enough about practical results.  Such scientists, Lysenko insisted, waited too long to produce their findings.  They waited for experimental results while Soviet peasants starved.  “It is better to know less,” Lysenko famously quipped, “but to know just what is necessary for practice.”  Similarly, American creationists have tended toward a deep skepticism toward mainstream science.  In spite of what some critics have assumed, creationists have usually not presented themselves as opponents of science as a whole.  Rather, American creationists have tended to argue that mainstream scientists been led down an unscientific path.  Like Lysenko, American creationists have offered their science as superior to the kinds of immoral and impractical science coming of major research universities.

Finally, one important parallel between Lysenkoism and American Biblical creationism has been the effect of each on teaching.  Those interested in American creationism will not be surprised to hear that high-school textbooks in America have tended to downplay the importance of evolution.  For example, Ella T. Smith’s 1938 edition of Exploring Biology (Harcourt, Brace) informed readers that “Evolution is a fact.  Plants and animals do change and have been changing.” In this edition, she told readers that for humans, too, “The fossil evidence is conclusive that man himself did not appear suddenly on the earth in his present form, but has gradually developed from a much more primitive species.”  The results of political pressure on publishers can be seen in the next editions of Smith’s book.  In the 1954 edition of this book, Smith backed away from her calm assertion about the facticity of evolution.  She told readers that evidence “leads scientists to the conclusion that the plants and animals of today are the changed descendants of the plants and animals of the past.”  There was another word to describe that change, Smith included, “That word is evolution.”  But Smith tended to use the word “change” instead.  When she described “the modern point of view,” for instance, Smith gave a bland description of evolution: “Biologists agree today that plants and animals have changed in the past, and continue to change.”  Even that vague reference to evolution did not satisfy the powerful critics.  By the 1959 edition, long references to “evolution” in the indexes of earlier editions had been cut down to one line.  Smith’s 1959 edition informed readers only that “The history of living things is a long one.  Much of it is still unknown.”  A ten-page section on the history of evolutionary theory was eliminated entirely, and in its place Smith offered a brief suggestion that students do a report on evolutionary theorists such as Darwin, Alfred Russel Wallace, Lamarck, or Hugo De Vries.

A similar progression marked the development of high-school textbooks in the Soviet Union.  One prominent textbook, Osnovy Darvinizma, by MI Melnikov, removed all mention of chromosomes and genes from its 1941 edition, though Melnikov had been an ardent supporter of the science of genetics before then.  According to David Joravsky, secondary science education in the Lysenko era became “a mixture of natural history, old-fashioned Darwinism, and meaningless chatter about Michurinism.”  As the political strength of Lysenkoism increased, so did the proportion of textbook content devoted solely to Lysenkoist ideas.  It was only in 1966 after Lysenko had been deposed that secondary-school textbooks in the Soviet Union again included any measure of modern science.

Certainly, there remain enormous differences between the Lysenkoist critique of mainstream science and the creationist one.  For evolutionists and mainstream scientists, however, it is important to note that attacks on the legitimacy of their work can come from many different directions.  Ralph Spitzer’s academic leftism demonstrated just as much contempt for the impartiality of mainstream science as would the right-wing critique of science by any creationist.

For creationists, it must be of significant interest that the mainstream scientific establishment can be threatened so significantly by political regimes.  The ability of Lysenko to promote his vision of proper science for decades, despite the vociferous objection of the mainstream scientific establishment, must offer an intriguing glimpse into the possibilities of alternative science.

FURTHER READING: “Lysenko Theory Sets off West Coast Imbroglio,” Harvard Crimson, May 25, 1949; Tom Bennett, “The Spitzer Affair: President Strand and the Communist Threat,” The Oregon Stater (February, 1997): 21-25; “College Ousts Professor Over Theory,” Pasadena Star News, February 24, 1949, pg. 2; David Joravsky, The Lysenko Affair (Harvard University Press, 1970); Valerii Soifer, Lysenko and the Tragedy of Soviet Science (Rutgers University Press, 1994); Loren Graham, Science and the Soviet Social Order (Cambridge: Harvard University Press, 2002); Jerry Bergman, “Recurrent Laryngeal Nerve Is Not Evidence of Poor Design,” Acts & Facts 39 (2010): 12-14.

 

 

Intelligent Design Defended

Who’s afraid of irreducible complexity?  As followers of the evolution/creation controversy are aware, the intelligent-design court case that won the most public attention was Kitzmiller v. Dover in 2005.  In that case, school board members introduced the intelligent-design textbook Of Pandas and People into the curriculum of the school district of Dover, Pennsylvania.  They required ninth-grade biology teachers to read a statement that evolution was only one way to understand the origins of life.  In the end, Federal Judge John Jones ruled against the use of intelligent-design materials in public schools, deciding in line with US Supreme Court precedent that if such curricular materials did not have a primarily secular purpose, they could not be used in public schools.

In a recent review of two new books defending the scientific legitimacy of intelligent design–or at least the scientific problems with neo-Darwinism–Howard Kainz of Marquette University celebrates the fact that even atheists can find holes in neo-Darwinism.  Are such books good news for religious anti-evolutionists?  Kainz seems to think so, but I believe the case is much more complicated.

First of all, the US Supreme Court and Judge Jones have not insisted that scientific arguments against evolution are not proper for public schools.  Rather, the “Lemon test” coming out of the Supreme Court’s 1971 ruling in Lemon v. Kurtzman stipulated three rules for testing the acceptability of public aid to religion in schools.  First, the government action must have a secular purpose.  It must not primarily advance or inhibit religion.  And it must not result in “excessive government entanglement” with religion.

The reason Dover’s intelligent-design curriculum did not pass the Lemon test was not because no scientists questioned the validity of the neo-Darwinist explanation of the origins of life.  Rather, the Dover curriculum was easily proven to be a strategic way for religious creationists to repackage their message in a way they thought might be more palatable to public schools.  The authors of the textbook at issue, for instance, Dean Kenyon and Percival Davis, left a paper trail in their various editions.  In earlier editions, the Biblical source of the authors’ ideas is far more prominent.  In reaction to the Supreme Court’s ruling in Edwards v. Aguillard (1987), the authors and their publisher consciously and explicitly toned down religious references to produce a cleaner, less explicitly religious textbook.  The same thing was true of the Dover school board members who introduced intelligent design into Dover schools.  It was not difficult for a reasonable observer to conclude that their motivations were primarily religious.  They hoped to advance religion, not to advance scientific understanding of the complexities of evolutionary theory among Dover’s ninth-graders.

The fact that “atheist” writers can find fault with neo-Darwinism, or that atheists can appreciate the notion of intelligent design, would not have had any impact in the Dover case.  Instead, a case will need to come before a federal court in which mainstream scientists themselves insist that the modern evolutionary synthesis must be taught as one explanation among others.

The second reason why books like these ought not be taken as a victory for religious anti-evolutionists is because they prove that the strongest critics of neo-Darwinism are not Bible believing creationists but rather mainstream scientists themselves.  As I’ve argued in other posts (see my anti-evolution imagined arguments against mainstream scientists’ “closedmindness” here and here; and my pro-evolution rejoinder here), creationists sometimes claim that the only reason they are not listened to by mainstream science is because of a vast evolutionist conspiracy.  If mainstream scientists only considered the weaknesses of the modern evolutionary synthesis, they insist, they would agree that neo-Darwinism can’t hold water.

But books like these demonstrate the fallacy of such notions.  The harshest critics of evolution are often evolutionists themselves.  Instead of asserting an intellectual totalitarianism to block all criticism of evolution, evolutionists are the most pressing critics of their own beliefs.  Their intellectual training pushes them to question all preconceived notions, even their own.

 

Evolution and Creation: One Historian’s View

The Evolutionary Studies program at Binghamton University has published some audio from my talk last week about creationist thought and its history.  I’d like to thank the EVoS folks for the opportunity to address the seminar.  The interview beforehand and the questions and discussion afterward were very lively and provocative.  The students, faculty, and other audience members raised terrific points and mind-expanding challenges.

An audio recording of the talk, ‘Surely You’re Joking, Mr. Huckabee:” Creationism in Historical Perspective’ is available here via EVoS’ website.  You can also listen to a podcast of the interview with David Sloan Wilson’s students.  A sharp bunch!

ANTI-EVOLUTION Ib: Poor Results II

For biblical Christians, however,the question is not so simple.  As evolutionary ideas became more influential, a large segment of Christians concludedthat such ideas were not compatible with their scriptural beliefs.  Some critics (including this author in an upcoming post) may argue that anti-evolutionreligious beliefs only developed recently, and that they therefore are not essential parts of traditional belief systems. But that argument doesn’t recognize that anti-evolution beliefs naturally only developed as the evolutionary threat became more culturally powerful.  Why would traditional Christians develop an anti-evolution theology before they had to?  Why would biblical Christians consider the importance of their special creation beliefs when such beliefs were unchallenged?

In short, biblical Christiansbelieve that the Bible is God’s instruction book for human living.  It is essential—not optional but
essential—that every part of it be respected and heeded.  God gave this book to humanity.  God wanted humans to use this book as their
path to salvation.  The Bible, in one way of explaining it, was God’s invitation to humanity to join him in blessed eternal life.

Any idea that contradicts thewords of that Scripture must be not only wrong, but pernicious.  The Bible clearly and concisely explains theorigins of life, including human life. Any merely human idea, such as evolution, that contradicts that biblical explanation does not even need to be considered.  It must simply be rejected.

Although it is not usually a goodidea for humans to try to deduce divine reasoning, this case almost shouts out for such an explanation.  We can see in the social results of widespread evolution education an example of what can happen when humans ignore God’s rules and try to substitute rules of their own.  God gave humans the Truth.  That truth was not only true, but healthy for humans to understand and believe.  When more people were taught biblically, society was less disgusting.  When more people were taught that humans were
created by a loving God, s ociety was less similar to a zoo with no cages.

Even for those who are not impressed with a scriptural argument, however, evolution education should still be understood as a deadly threat.  Even if one is not convinced that the Bible or other holy writ must be the starting place for our understanding of humanity and the universe, the notion that children today are educated in a way that is starkly different from the past should give one pause.  Because even if we are convinced of the basic truth of evolution, we can’t help but notice that it is a fundamentally different way of understanding humanity.  It has been taught to generations of American kids, now, without an adequate understanding of the moral revolution that it
implied.

It might be easier to understand the problem if we imagine a little more intellectual distance, a different perspective.  Consider how you felt when you read about the religious worldview of an isolated Amazon culture suddenly attacked by modern western culture.  The Yanomamo, for instance.  Just as with other cultures that have been overwhelmed by Western Euro-Americanism, the path of this
previously isolated group was depressingly predictable.  The people descend into alcoholism and depression.  Suicide and crime rates
shoot up.  Young people spend their days huffing glue and cutting their arms.  Their fundamental cultural norms were shattered; their traditional explanations of life and the universe no longer hold up.
There is no longer any compelling reason for young people to exert themselves.  They look, instead, for animal pleasures to fill the void.  And the obvious question becomes: Why is it bad when it happens to them, but acceptable when it happens to your own culture?

ANTI EVOLUTION I: FURTHER READING

William J. Bennett, The Index of Leading Cultural Indicators (New York: Simon & Schuster), 1994; Richard Dawkins, “Put Your Money on Evolution,” The New York Times Review of Books, April 9, 1989, pp. 34–35; Arnold B. Grobman, The Changing Classroom: The Role of the Biological Sciences Curriculum Study (New York: Doubleday, 1969); Gerald Skoog, “The Coverage of Human Evolution in
High School Biology Textbooks in the 20th Century and in Current State Science Standards,” Science and Education 14 (2005): 395-422.