Tag Archives: Book Review

Thoughts on Human Diversity

Human diversity is complex and controversial, but we know more about our diversity now than at any other point in human history. Charles Murray’s latest book, Human Diversity: The Biology of Gender, Race, and Class, has stirred up op-eds and disagreements in which critics have correctly focused on Murray’s suboptimal description about polygenic scores and the presumed causally between genetic associations with phenotypic traits. The points critics have raised are important and although I largely agree with these criticisms, others have already sufficiently discussed them. Here, instead, I want to focus on my thoughts about the race section of Human Diversity, and Murray’s argument against the idea that race is a social construct.

I have remained intentionally mute on the ongoing scholarly debate of race differences in psychological traits. The debate can be summarized as two oversimplified positions. On one side of the debate, the argument is that race is a social construct in which proponents assert that race differences in skin color or other outwardly visible traits do not correspond to meaningful differences in psychological traits, with IQ being the primary trait of focus. The other side of the debate argues that race is not a social construct, and there are real, partly genetically based differences between races in psychological traits, including IQ.

This debate about the ‘realness’ or ‘biologicalness’ of race intersects with various orthogonal questions: Can the term “race” be used interchangeably with “population”? What evolutionary processes are responsible for any observed differences? If natural selection is responsible for these observed differences, what are the selection pressures that prompted the differences?

Murray, unsurprising to many reading this I would presume, argues against the ‘race is a social construct’ position and states that there is sufficient evidence to reject the proposition that race is a social construct. Human Diversity includes three chapters dedicated to laying out his argument for why race is biologically real. The first chapter focuses on genetic distinctiveness among ancestral populations; the second on evolution since humans left Africa; and the third on population differences in genetic variants associated with psychological traits. This evidence, Murray argues, is supportive of the position that race is a biologically ‘real’ entity.

I disagree.

For a few years now, I have been passively observing the biological race debate unfolding between academics and intellectuals online, wrestling with the arguments and data to come to a confident conclusion about my own position on this topic. Reading Human Diversity has led to the culmination of my position that, yes, race – as has been historically and culturally defined, predominantly by skin color – is more of a social construct than a biological reality. Independent of this conclusion, even if one were to hold the view that race is ‘biological’ Murray’s argument for such a view is simply unconvincing.

The basis for my position that race is more accurately described as a social construct rather than a biological reality rests on two primary points, described in detail below. First, using the terms “race” and “population” interchangeably is inappropriate and inaccurate.  And, second, the extraordinary genetic diversity within continental regions is largely ignored, and currently, too limited to draw convincing conclusions about race differences in psychological traits.

Importantly, however, I do not disagree with the data that Murray presented in these chapters, but I do disagree with the conclusions he draws from them, and I find his presentation of the argument for the position that race is not a social construct inappropriate given the data he uses as support.

I do agree with the claim that human populations differ genetically and for many evolutionary-related reasons. This is an indisputable fact of modern genetic findings that cannot be dismissed. But that human populations differ genetically is not synonymous with the claim that human races differ genetically. Using “population” in place of “race” is a slight I’ve seen used to support the position that races – Black, White, Asian – differ genetically in meaningful ways that contribute to psychology and behavior, which I view as incorrect.

This inappropriate term-switching is used by Murray often in the race chapters of his book. The inconsistency is apparent by looking at the title of the book and comparing it with the chapter titles and propositions in the race section of Human Diversity. To argue against the position that race is a social construct, Murray inappropriately uses data about human populations. Although he defends his term switching by rightfully stating that race has “outlived its usefulness when discussing genetics” (p.135) he then proceeds to inappropriately use the term race throughout the chapters, and uses populations data to support his claim that race is biologically real. (At one point he even refers to other hominid species as “races” of humans.)

That human populations differ genetically, and that Africans, Europeans, and Asians have some broad-level statistical covariation in models is a more appropriately a reflection of human migration patterns over evolutionary history, than meaningful categorical distinctions for understanding psychology. As the number of groups in these statistical models increases, populations begin to split off by regions within these broad continental groups, as Murray shows. Specifying three, seven, or 15 groups, however, is a rather arbitrary decision. Imagine you are an alien visitor with only the genetic data that Murray describes in Chapter 7. Would you pick three groups? Seven? Why? Without pre-existing cultural concepts of race, it is hard to justify an answer that corresponds with socially derived racial groups.

Another problem with these kinds of data is that the data we have from populations within Africa and Asia are incredibly limited relative to that of populations from European. The genetic diversity in African populations is notoriously diverse, yet we have comparably minimal data. As Dr. Adam Rutherford discussed in his book, two Africans are likely to be more genetically distinct from each other than either is to a European. To simply lump all Africans into a single racial group is lazy, misinformed, and more of a reflection of the dearth of data that we have from the continent – an argument that Rutherford articulates elegantly in his book, A Brief History of Everyone Who Ever Lived.

The lack-of-data problem leads me to another criticism of Murray’s argument, which he outlines in Chapter 8: that “evolutionary selection pressure since humans left Africa has been extensive and mostly local”. I have two problems with this line of argumentation. First, what seems to be ignored here is that evolution didn’t stop in African populations when some humans migrated out of Africa – populations in Africa continued to evolve and change, too(!).

The chapter describes evolutionary processes responsible for changes in genetic frequencies between populations, and how migration causes reduction in genetic diversity in the migrating populations. But, the ability of genes to vary (for various evolutionary reasons) across populations does not necessitate that there is, or has been, selection pressures to build adaptations between populations, nor does it make it necessarily more likely. The fact that migrating populations can contribute to genetic differences between Africans (as a group) and Europeans (as a group), must also apply to different (migrating) African populations. The argument is not specific to races; though when Murray frames his argument as ‘evolution post-Africa is extensive’, the evolutionary changes within Africa are ignored.

The second problem I have with this argument is that nearly all the evidence for local adaptations across populations are related to specific physiological process or medical disease traits, not psychological traits. Murray and most other’s arguing for his position describe several population specific traits: sickle cell, altitude adaptations, lactose tolerance, etc. (which don’t even vary consistently across racial lines anyway). The primary difference between these kinds of adaptations and the proposed psychological traits that proponents of Murray’s position argue for, such as IQ or personality, is that the physiological and disease traits have clearly defined selection pressures underlying their evolution and extensive empirical support. Proposals for psychological race differences, however, do not, nor is there strong evidence in support of the claims that I have read. A recent study by doctoral student Kevin Bird tested this idea specifically and shows that IQ differences between Blacks and Whites are not genetically driven nor is there evidence of natural selection operating to produce differences.

Although I think evidence of race differences in psychological traits is unlikely to be (accurately) found in the current research environment, I do not think it is unreasonable to hypothesize and explore questions related to psychological differences between populations (or races). However, it seems to me that the likelihood of finding differences between races is more unlikely than finding differences between populations. Because the variation within races (e.g., ‘blacks’ and ‘whites’ as broad groups) is undoubtedly larger than the variation within specific human populations, the effect sizes for ‘race’ differences would have to be large relative to population differences to be accurately detectable.

Moreover, as I mentioned above, we have an extremely limited amount of genetic data from African populations, relative to populations in Europe and (east) Asia. Thus, current results comparing data from one European population and data from one African population, for example, tells us only about those two specific populations, not about Whites and Blacks as racial groups. More accurate information will be known as the amount of genetic data from non-European populations becomes comparable to that of European populations, and problems of comparing across human populations is resolved.


Murray’s claim that we should move on from the use of race in genetics in favor of population is one I agree with. But that is not consistent with the claim that race is not a social construct. Race, as he describes in Chapter 6, came into the cultural lexicon to categorize people by different skin color and other outward features. What genetics has done is to clearly show that race as skin color or outward features is not a proxy for genetic variation of human populations. Two populations can look the same, but be genetically distant. As Rutherford explains in his book, using ‘black’ skin as a categorical marker hardly makes sense.

What genetics has done for our understanding of race is analogous to what happened in taxonomy with the evolution and genetic revolutions. As described by Dr. Carol Yoon in Naming Nature, taxonomy historically was based on the outward appearance of organisms. Humans have all sorts of culturally useful names for categories of animals, such as fish, birds, and bugs. These categories of animals, like humans, contain enormous diversity within them. Dolphins and trout both swim, bats and magpies both fly, but these outward characteristics from which we group them do not correspond to the biological reality of their relatedness.

This is what has happened with race, in my opinion. As our knowledge of genetics and human diversity has flourished, race – once a seemingly reliable, accurate, and obvious way to categorize human groups – has become a social construct with the acquisition of knowledge. We now know that social categories of race as defined by skin color are not a reliable and accurate way to categorize human groups. So, Murray is right to say that race is no longer an appropriate way to discuss human diversity. He is wrong to conclude from this that race is therefore not a social construct. Race, in my view, is as biologically real as the socially derived, yet meaningful, category “fish”.

Brief Book Review: The Education of an Idealist


Memoirs are a new genre I’ve been exploring recently, The Education of an Idealist being my third over the past few months, preceded by Educated: A Memoir and Becoming (Michelle Obama needs no subtitle). The common thread throughout each has been the personal education journey of the subject, despite the actual journeys of Tara, Michelle, and Samantha being exceptionally different.

Samantha’s journey began in Ireland and followed her to America when she was a young girl. She ferociously absorbed American culture throughout her childhood becoming intensely passionate about baseball – a sport which I could never quite grasp the interest of. The aspect of her story which I liked most was that her path wandered, beginning in sports journalism, and ending as the United States Ambassador at the United Nations. The stories of many successful individuals, in contrast, tend to look linear in hindsight: a determined person with a clear goal since adolescence. A story that is true of only a select few.

Samantha was humble throughout her story, intimately sharing her deepest insecurities, uncertainties, and fears with the reader. She acknowledged when serendipitous events, like meeting Barack Obama, were pivotal moments in her life course, as they so often are. But it is nonetheless comforting to hear about someone who reaches the echelon of their career by following a meandering path sprinkled with gracious opportunity.

The part of her story that was most interesting to me was her role as a foreign correspondent in the Balkans during the Bosnian genocide in the 1990s. There she learned of suffering, geopolitics, risk, and reporting. I had never before read from the perspective of a foreign correspondent, especially not during a tumultuous time in Balkan history. It was a particularly engrossing part of the book, perhaps because of the salience of being in a war zone and perhaps because I was too young at the time of the events to know of their occurrence.


But it is nonetheless comforting to hear about someone who reaches the echelon of their career by following a meandering path sprinkled with gracious opportunity.


Because of Samantha’s roles – as a foreign correspondent, as an aid for then Senator Obama, and finally as UN ambassador – her book not only served as story worthy of sharing, but also as an interesting history and political lesson. A substantial portion of her book focused on Balkan history, but an equally substantial portion of her book focused on UN international relations, particularly with Russia. She plainly portrayed the difficult position the United States is in when human rights issues intersect with geopolitical ones, such as the recognition of genocide on the world stage, and action in response to the use of chemical weapons in Syria.

Samantha’s story showcases the contrasting reality of geopolitics with idealistic goals – goals from which she admirably never wavered on. Her educational journey throughout her story is evident – in her career and personal life. Learning about her story, and those of Tara Westover and Michelle Obama, demonstrates how deeply personal education really is, the true essence of which is too often lost in current educational institutions.

Brief Book Review: Mind in Motion


A goal of mine for 2020 is to write more — a goal many academics commit to each year. This year, however, as I have stepped away from the ivory tower, I am going to make a concerted effort to write more public essays and blog posts now that I am far less tied to the necessity of formal academic publishing. As part of this goal, I am introducing a new series, Brief Book Reviews, where I will do exactly as the title suggests: I’ll offer brief reviews of (hopefully) all the books I read this year. I hope to provide readers with at least a couple of interesting recommendations. (To see my 2019 book recommendations, see here)

First up for 2020 was Mind in Motion: How Action Shapes Thought, by Barbara Tversky. I first heard of this book on Sam Harris’ podcast where he discussed Tversky’s interesting thesis that action and motion are the basis of abstract though. The thesis was phenomenally interesting as, evolutionarily speaking, we (and other animals) evolved diverse means of communication previous to the evolution of our remarkable and complex language systems. Her thesis is doubly interesting in that one hypothesis for the ultimate function of the brain (or, centralized nervous system) that I find enchanting is that the brain ultimately evolved to facilitate locomotion — all animals must move; and, those that do not, typically don’t need a brain. Take, as a favorite example of mine, the sea squirt (and other related species) which, upon locomoting to a suitable permanent location to attach to, it promptly digests its own brain — it is no longer needed.

To continue reading, click here.

This post originally appeared on my Medium account on 22 January 2020.

The Most Interesting [Non-Fiction] Books I Read This Year — 2019


This year has been filled with many wonderful books. Below are my top five most interesting books I read this year. These five books are diverse, each covering a different knowledge area, which I think is reflective of my effort to branch out (I even read a novel this year — a first in many, many years). Everyone’s “to read” list is too long, but hopefully at least one of these will snag a spot on your 2020 reading list. Happy reading.

1. The Second Kind of Impossible: The Extraordinary Quest for a New Form of Matter by Paul J. Steinhardt

The Second Kind of Impossiblewas an experience from start to finish. For the last year I had been searching for history of science books (my current favorite genre) and I stumbled upon this book on a display table at my local Barnes and Noble on a Saturday night book run. The reason I bought it? It was on sale. I had never heard of the book, despite it just being published a few months prior. It sounded interesting enough, and physics is my second favorite science subject next to evolution. The book sat on my “to read” pile until July when I cracked it open over the holiday weekend.

This book is the embodiment of a scientific journey. Pual Steinhardt recounts his 35-year journey to discover a new form of matter, “quasicrystals”. Through improbable set backs, inspiring insights, and far-flung journeys to the tundra, this is a journey that you just can’t wait to see how it ends. Part of what made this book so fascinating and exhilarating to read was that I had no prior knowledge of any aspect of the book. I didn’t know what a quasicrystal was, I did not know who Paul Steinhardt was, and I hadn’t read even a word about the final discovery. I have yet to read another science discovery book that was as enveloping as this one. Even if physics is not your topic of choice, the book is focused on the journey rather than dense scientific details, and is absolutely worth a spot on your “to read” pile.

Buy it here.

To continue reading, click here.

This post originally appeared on my Medium account on 1 December 2019.