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Hi, welcome to my blog. I am an ever-curious observer of the world, with a passion for understanding the universe in which we inhabit. I am particularly interested in humans and human nature, understanding human similarities and as well human differences.

As you can see from the national emblems above, I am a second generation Jamaican-American of Black, White (English), Indian (Asian), and Chinese descent, living the motto “out of many, one people.”

On this blog, I talk a lot about Human Bio Diversity* or HBD. This is the field of research concerned with heritable human differences, between individuals and between human groups, including gender and ethnicity. You will see a lot of posts discussing heritable human differences, and the impact of said differences on society.

I discuss this because – beyond the simple fact that it fascinates me – because I want to understand how the world actually is, as any good scientist should. Unfortunately, the study of heritable human traits, particularly when it comes to human differences, is currently unfashionable in the Western world. It is regarded as a taboo topic in mainstream public discourse, costing people their careers and stymieing research in the field. In my search for the truth, I am not inclined to shy away from a topic just because it’s taboo, if it’s what I must do to uncover the truth.

As a person of color who grew up in the American inner city, I have had exposure to a variety of different human societies, making me curious about human differences. Now I seek to explore and understand those differences.

Politically, I’m very liberal, (see: My Political Alignment), both socially and economically. However, it’s important to always put one’s political views second to the facts about reality. Unfortunately, many people seem unable to do so, leaving the truth to get mired in personal and institutional dogma.

I am also an atheist, but I don’t see this as being particularly special, as this is only as any scientist naturally should be, although I understand and accept that that is not always possible (see “HBD and Atheism” below).

little-miss-jay jayman-jr I currently live in Maine. I’m married (to a White woman, a native Mainer) and have two children, a beautiful two-year-old son, and a lovely newborn daughter.


First and foremost, if you’re new to HBD, and want to know what this human biodiversity stuff is all about, and would like a quick and concise primer into this HBD stuff, especially a treatment of the common misconceptions/misinformation on the topic, see my page JayMan’s Race, Inheritance, and IQ F.A.Q. (F.R.B.)

And for the important pieces of evidence, please see my page HBD Fundamentals for a list of key reading and pieces of evidence for HBD. For those without any background on the topic, I strongly recommend the four books under the “Start with” section. However, if you want a less dense introduction to the topic, I’d recommend my blog posts below.

If you’re new to my blog, to understand where I’m coming from, I recommend that you read the following posts, ideally in the order listed (this list will be updated as new posts are added):

Start here: Why HBD

All Human Behavioral Traits are Heritable

Environmental Hereditarianism

The Son Becomes The Father

More Behavioral Genetic Facts

How Much Hard Evidence Do You Need?

IQ Ceilings?

An HBD Summary of the Foundations of Modern Civilization

How Inbred are Europeans?

A Tale of Two Maps

Welcome Readers from Portugal!

More on Farming and Inheritance Systems – Part I: IQ

Predictions on the Worldwide Distribution of Personality

National Prosperity

NEW Clannishness – The Series: Zigzag Lightning in the Brain

NEW “Ethnic Genetic Interests” Do Not Exist (Neither Does Group Selection)

NEW Regression to the Mean

NEW Features and Bugs

Finland & Japan

North American Nations 4 3 See my series on the historical and genetic roots of the ideological and other psychological differences among White Americans in different regions of the country. My page American Nations Series lists the major posts and gives a brief description of each.

I would suggest reading these posts in the following order:

A Tentative Ranking of the Clannishness of the “Founding Fathers”

Flags of the American Nations
The Cavaliers

Maps of the American Nations

Rural White Liberals – a Key to Understanding the Political Divide

More Maps of the American Nations

Demography is Destiny, American Nations Edition

Genes, Climate, and Even More Maps of the American Nations

Sound Familiar?
Germania’s Seed?
Religions of the American Nations
Nations of Canada
Colors and Lights
Snow Nations

Be sure also to see this post on the nature of rational inquiry: Carl Sagan’s Baloney Detection Kit

For a review of the major topics I’ve discussed on my blog, see this post: 100 Blog Posts – A Reflection on HBD Blogging And What Lies Ahead, and this one: 200 Blog Posts – Everything You Need to Know (To Start)

As well, be sure to see the posts covering my “pioneer hypothesis”, talking about fertility trends and their relation to political orientation and colonial history:

Liberalism, HBD, Population, and Solutions for the Future
A follow-up: Ethnicity and Politics
Another Tale of Two Maps
The Liberal/Conservative Baby Gap: Time Depth
Further Testing the Pioneer Hypothesis: Canada and Russia
Why sub-replacement fertility is not necessarily all that bad
Expectations and reality: a window into the liberal-conservative baby gap
Dystopian Conservative Future?

My other posts on fertility trends:

Solutions, Again
A Success Story?
Are you missing out by not having kids? Your DNA sure is…
For every person that doesn’t want kids there are 25 that do. Is that so?
A Tale of Three Maps
Fertility and Happiness: A Global Perspective
Another reminder…
Who’s Having the Babies?
Idiocracy Can Wait?

My posts on parenting and psychological development:

Taming the “Tiger Mom” and Tackling the Parenting Myth
Should Parents Lose Custody of Obese Kids?
About Developmental Noise
Little Emperor Syndrome my…
Apples, Oranges, and Lesbians: The Nurture Assumption Just Will Not Die

My posts on health, particularly questioning the conventional wisdom on obesity and cardiovascular health:

See my page Obesity Facts, which collects key and uncommonly known fact on the phenomenon of obesity

A Fat Problem With Heart Health Wisdom
Exercise, weight loss, and keeping you alive – yet another tale of maps
And Yet Another Tale of Two Maps
A Fat World – With a Fat Secret?
Fun Facts About Obesity
Gary Taubes on Obesity and Bad Science
Obesity and IQ
IQ and Death
Even George W. Bush Has Heart Disease
Trans Fat Hysteria and the Mystery of Heart Disease
HBD is Life and Death
Sugar & Antibiotics

My posts on gender, sex, and sexual identity/orientation:

Special Post: The Decline of Male Homosexuality
The Evolution of Female Bisexuality
A Gay Germ? Is Homophobia a Clue?
Gay Germ Fallout?
Greg Cochran’s “Gay Germ” Hypothesis – An Exercise in the Power of Germs
Female Same-Sex Attraction Revisited

IQ and Kink?

The Leaks in the Pipeline Found?
Beauty and brains: not always together?
Women and Sleep

Sure it does…
Some guys get all the babes – not exactly
It’s not the cads, it’s the tramps
“Manosphere” Community Beliefs: Truths and Nonsense

My posts on more philosophical topics, such as religion and free will:

HBD and Atheism
What if it’s not their fault? The myth of free will.
Sam Harris on free will
The Meaning of it All…
The Atheist Narrative
No, You Don’t Have Free Will, and This is Why

My posts on astronomy and the future prospects of human space travel/colonization:

A Whole New World
A Less Lonely Universe

See my page Blog News for the latest happenings on the blog.

My posts may also be viewed by category, by clicking the categories from the cloud at right.

Learning about the facts of human nature and the reality of biological human differences may force one to abandon certain hopes and dreams about how to make a world. One must have a certain amount of Serenity in order to accept the biological reality.

iss-flying-over-planet-earth As for my WordPress/Twitter avatar, this is a still from a video of the International Space Station flying over the Earth. I chose this photo because it speaks to all that we discuss, and more. HBD’ers talk about the world around us and its people, which is represented by the whole Earth, seen in all its brilliant glory below the space station in this photo. But the starry sky lying above is a reminder that this world is but a tiny part of an entire universe beyond it. The ISS in the foreground is itself a sign of Man’s ability and desire to reach into this great beyond. This photo is perfectly symbolic.

Be sure as well to follow me on Twitter!

*See this 13-minute video of Steve Sailer, who coined the term human biodiversity, discussing it.

My current theme song. Rock out with The Rock!

(Republished from JayMan's Blog by permission of author or representative)
• Category: Science • Tags: WasPage 
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  1. Kiwiguy says:

    Really interesting site JayMan.

    • Replies: @JayMan
  2. Staffan says: • Website

    Great blog. I just hope more people will discover it.

    • Replies: @JayMan
  3. Kevin says:

    Let me to say that I’ve realized you’re a regular reader and commentator on Chateau Heartiste’s website. I think your trend towards these kind of subcultural trash and PUA scam sites makes you lose intellectual category. That discredits you as a scientific blogger.

    • Replies: @JayMan
  4. Harold says:

    You’re not going to take up Chris on his offer?

    • Replies: @JayMan
  5. JayMan says: • Website

    Don’t tell me you’re going to fall victim as well?

    If you’ve read my posts there, you’d see that I often criticize the non-scientific conclusions that are often put forward by Heartiste and his commenters. I will agree when he raises a valid point, however.

    I call it as I see it. If you’re right, I’ll say so. If you’re wrong, well, I’ll also say so…

  6. Kevin says:

    Im sorry if you felt offended. I use to visit site for reading all these game ridiculous ideas. Something about that PUA guy, his blog has always sent red flags of Bullshit to my sub-conscience. His patterns include elaborates some pseudoscientific explanations. Loaded with misogyny and biased perceptions, and most of them are contradictory. It seems he delete controversial comments, mainly anti-game comments.

    I’ve tried to write to refute your comments but I am always censored. You’ve never published any of my critical comments. I have to say that he also writes decent content on anti-feminist and sociobiology. But this dude’s blog activities are suspect! Most his a article get 150-200 comments within 3 hours or less! Is it impossible? No, but highly unlikely (without input from the blog’s author).

    – I read few of those comments, and they were incoherent and inconsistent with the article’s theme.

    – Hardly None of those comments came from fellow bloggers, aspiring PUA’s or Manosphere guys(as usual).

    So who the fuck is commenting on Heartiste’ posts then!!!?

    My detective-like intuition tells me that this MOFO is rigging his blog’s commentary in order to make his blog appear more active than it actually is.

    To add more wood to the flame, my hunch says that he actually concocts and pre-fabricates 95% of the comments on his posts. In layman’s term: he pre-writes his own comments, and somehow schedules them to be posted at intervals [nice trick lol].

  7. kevin says:

    I wanted to write “he has never published” and “to refute his comments”
    It was a mistake sorry

  8. JayMan says: • Website

    I responded with an offer of my own. Let’s see if he takes me up on it.

  9. Staffan says: • Website

    For some reason I only reach the “about” page of this blog. Is this intentional? I rather see the most recent post first like in most blogs.

    • Replies: @JayMan
  10. JayMan says: • Website

    It was, I wanted to be sure people saw my “About Me” page. It’s changed back now.

  11. JayMan says: • Website

    Thanks, and thanks! 😉

  12. denise says:

    Great blog, I love it. I just stumbled on it and I’ll be working my way through your old posts.
    Do you study this stuff for a living?

  13. coward says:

    Hey, man, I’m Coward. I came here from the link on Robert Lindsay’s blog. I can identify with your racial background; like you, I am part Black, part White, and part Asian (Native American). I am a race realist, so I strongly agree with your views that all human behavioral traits are inheritable. I am glad to find another Black person who thinks this way. I love your motto: “Out of many, one people”. I look foward to seeing your posts! Keep up the good work!

    • Replies: @JayMan
  14. JayMan says: • Website

    Well welcome aboard, and thanks! Yeah, there aren’t too many of us, aren’t there (or they stay awfully quiet)?

    The next post is my 100th post, so stay tuned!

  15. frank says:

    what city are you in jayman”

  16. Frank says:

    I’ll try again, with decent capitalization and punctuation – what city are you in? I only ask because I’m in New York for a few weeks, and if you were there – as I suspect – I was hoping we could get together. I appreciate your work.


    • Replies: @JayMan
  17. JayMan says: • Website

    Unfortunately, I won’t be in New York until maybe next year. Thanks for the offer and the compliments, though! 🙂

  18. Frank says:

    Too bad.

    You’re welcome. You do a nice job.

  19. jewamongyou says: • Website

    I’ve got to check out your most interesting site more often. Good stuff here. By the way, in your most recent post about corporal punishment, I assume you meant (in the first line) “corporal” and not “corporate”.

    • Replies: @JayMan
  20. JayMan says: • Website


    Thanks! Be sure to see my 100th blog post and my HBD Fundamentals page.

    Thanks for the heads up on the typo. Fixed!

  21. Anonymous • Disclaimer says:

    free will is real

    • Replies: @JayMan
  22. JayMan says: • Website

    Based on what? Your say so?

  23. Anonymous • Disclaimer says:

    Hi– I just found your blog, and was impressed by the connection that lactose intolerance means getting fewer calories from dairy. It’s so obvious, but I haven’t heard it elsewhere.

    Your cardiovascular death rate map for Europe might fit with the idea that more sunlight = better heart health.

    Do you know of any research about the extent to which people overreact to human differences?

  24. Anonymous • Disclaimer says: • Website

    I just found your blog, and I have to say, I wish I had found it earlier. I have also been interested in human nature and HBD for many years, and for the last few years I’ve focused more on the ecological aspects of human nature. I’m particularly interested in understanding human ecological dominance and what it means for the biosphere. I believe my Darwinian demon theory explains this aspect of human nature, and I just started writing about it on my blog As you will see, I also like to cut through the BS!

    • Replies: @JayMan
  25. JayMan says: • Website

    @Rolf Muertter:

    Thanks, I’m glad you enjoy the blog! I will be sure to check out your work!

  26. Jeff says:

    Could you offer us your thoughts on the cohabitation study that was in the news recently?

    My guess is that divorce “predisposition” (for lack of a better word) is genetically determined.

  27. JayMan, would you like to join the reviewer team for our open access journals Open Differential Psychology and Open Behavioral Genetics? Site here: We are trying to bring openness to the study of HBD related fields, instead of the closed access, non-data sharing that goes on in Intelligence and PAID.

    Please contact me at my email. 🙂

  28. Anonymous • Disclaimer says:

    I have been reading your blog for more than couple of months now and have learned a lot. It is really good and you are maintaining it very well. I would like to submit my post on your blog (as guest post) with my website link. Please let me know if you are accepting guest posts for free of cost and I’m ready to discuss my contents with you, I promise you with unique, quality and 100% plagiarism free content. I am looking forward to get your reply.
    Thank You,
    Tanya Schenck

  29. Anonymous • Disclaimer says:

    So I just discovered your blog. I’m very new to all this, and I am wondering what you have pursued as a college major, and to what degree level?

    • Replies: @JayMan
  30. Anonymous • Disclaimer says:

    Dear Jay Man, (bad english coming !).

    I am a young black african male (20) and I wanted to share some thought with you.

    I love neuroscience and especially the intelligence field. I am very aware of the reality of IQ (but I think scientists should accept the fact that people will never accept this as “intelligence”, it’s a vocabulary problem)

    I am aware of group differencies among sex, race… And I don’t really care, to be honnest, genetic don’t mean eternal nor “more valuable/better”, but this matter, whatever people like it or not.

    So I’m not surprised other black people are aware of this. (Even if I’m pretty sure in your case your white/asian admixture is not just a detail in your identity).

    But HBD.
    Seriously, HBD.

    There is a huge difference between science and racism, contrary to what your HBD friends think.

    I can read books like the Bell Curve because it’s facts. But look at HBD timeline on Twitter.

    “Feminism is for ugly women” Really ?
    Black assault pregnant white women ? is this SCIENCE ?

    And look at their “bibliography”. Some of their links are just people saying “Hey, I’m black and I agree”, and others are (false) old nazis theories. Have you seen what these hypocrites think (yes, “think”, not “know”) of mixed people ?

    There are numerous neutral blogs on the subject of intelligence (and cognitive genomics, in general) but HBD is not one of them.

    They are pro-white. Here’s the reality.

    Some people don’t like the idea of people having different level of intelligence.
    HBD crowd LOVE this idea. (Why would you HATE epigenetics ? This is a young science, but this a science too, if people could possibly deviate a little their offspring’s genetic fate, well, isn’t this a good news and a way to fill the gaps ?)

    In both case, this is not science. There are feelings and opinions.

    Once again, there is definetely a strong line between science and racism, sorry.
    I know what is science and what is disguised hate toward some people (aka = me. And I don’t have admixure as a “consolation prize”).

    Science is science but human have goddamn feelings. Saying truth is ok. Saying your opinion hidden under a truth is the worst thing humans can do.

    What is your opinion about this ? I think you’re not exactly like your HBD friend, but please stop using yourself as an “black caution” for HBD people.

    • Replies: @JayMan
  31. JayMan says: • Website


    Yes, I would agree that there is a huge difference between science and racism.

    That said, “science that demonstrates conclusions I don’t like” ≠ racism. Plain and simple.

    But look at HBD timeline on Twitter.

    “Feminism is for ugly women” Really ?
    Black assault pregnant white women ? is this SCIENCE ?

    Read this:

    The Problem with HBD, the Dark Enlightenment, Neoreaction, Alt-Rightism, and All That Jazz

    I have had my fair share of differences with the people that often fly under the “HBD” banner.

    Why would you HATE epigenetics ? This is a young science, but this a science too, if people could possibly deviate a little their offspring’s genetic fate, well, isn’t this a good news and a way to fill the gaps

    First off, epigenetics (specifically, transgenerational epigenetics) is complete garbage. Whatever meager bits of truth there may be to it (likely not much at all) means very little or nothing for the big picture of individual and group differences in psychological traits and other traits. See here:

    Science isn’t about “liking” or “hating” things. It is solely about (or should be) what’s true and what’s false. Good scientists keep that as their sole guideline.

    Science is science but human have goddamn feelings. Saying truth is ok. Saying your opinion hidden under a truth is the worst thing humans can do.

    I get what you mean, but I wouldn’t agree with that specific statement. What’s true is still true even if it is uttered for nefarious purposes.

    That said, yes, there are more than a few unsavory characters that embrace HBD for nefarious purposes. See what I wrote in my post above for my thoughts on the matter.

  32. JayMan, I need to ask something. I’ve read some things about the HBD movement. As a person who is also Black (I’m American Black though), much of what I’ve read stacks up against Blacks. I look at the concept from the perspective of a person who believes in personal responsibility, who believes that one’s own merit is suppose to be the important thing. I often question HBD because of the history of scientific racism, and people justifying cruel treatment towards people of color. I have read some of this, and this is how I look at it in a personal light: As someone who has a university degree, who isn’t involved in crime, I worry about stuff like this because there are those who will advocate making certain policies based on HBD. I have to consider that such policies would be stacked against me as a Black man, and that I would suffer. I have to ask this. In terms of HBD, what is in it for me? What would I get out of this being a Black man? How would it help me get the things I’m going after in life? How does it help me get a decent job? I ask because when reading this, I consider how this affects me. My first concern is me.

    • Replies: @JayMan
  33. JayMan says: • Website


    As someone who has a university degree, who isn’t involved in crime, I worry about stuff like this because there are those who will advocate making certain policies based on HBD. I have to consider that such policies would be stacked against me as a Black man, and that I would suffer. I have to ask this. In terms of HBD, what is in it for me? What would I get out of this being a Black man?

    Well, first things first: what you get out of it, what policies people may or may not advocate because of it, whatever views or attitudes people hold or advance has no effect on what is the key issue: whether or not it is TRUE. At the end of the day, what’s true is true regardless of what we want or would hope to think. We certainly don’t assess the truth of something due to its personal or societal impact.

    Now, that said, I don’t really have an answer for your questions, beyond saying that I would think that having a superior understanding of the truth is usually helpful in the long run.

    How does it help me get a decent job? I ask because when reading this, I consider how this affects me. My first concern is me

    That reaction is perfectly understandable. But coming away from that, would you assert that we should adjust our regard of the truth of a notion based on how it stands to benefit ourselves or society, and not whether or not it is actually true, as ascertained from the evidence?

  34. JayMan,

    For me a “superior understanding of the truth” is not enough for me. I look out for myself, first and foremost. I think this way because of this: If I don’t look out for me, who else will? I know that people will judge a person by the way they look. I care about what I get from it because I stand to benefit from being treated just like any other person in this society. I stand to be treated as equal under the law. I stand to benefit from having the same chances as anyone else. HBD will not help me get any of those things. Whether or not HBD is truth isn’t a concern for me. What is a concern for me is, myself, and how other people will treat me. How would it benefit me or you to be subjected to policies such as certain legal restrictions based on race? Society isn’t my concern. I know I will come off as selfish to others, but I’m also aware of what I will lose. Why should I embrace something that would ultimately hurt me?

    • Replies: @JayMan
  35. JayMan says: • Website


    Why should I embrace something that would ultimately hurt me?

    Well, why should you embrace gravity? Why should you embrace plate tectonics? Why should you embrace evolution?

    Hopefully you see the absurdity in the question.

    Whether or not HBD is truth isn’t a concern for me.

    As with the aforementioned things, your willingness to “embrace” HBD doesn’t change the truth of the matter. How you feel about your personal interests runs into similar problems as it would if you felt gravity or heliocentrism was at odds with your interests.

  36. @JayMan.

    This is the thing about gravity. Gravity and plate tectonics are not issues that have social implications. HBD is a different subject altogether. I don’t think about gravity or plate tectonics because those concepts have no bad implications on me as a Black man. All of that is just physics and geology. None of it has any social implications on me as a Black person.

    My ultimate concern in the end, is how people will use HBD, especially if it basically says “Blacks are hopeless”. What I’m hearing is that I should just accept it and take whatever policies come. To me, it is “Why shouldn’t I take it personal, especially if I stand to lose things”? And another question I have to ask is this. Do you think public policies should be made based on HBD? And if the answer is yes, what benefits to I get from it?

  37. Tony says:

    I’m a little disappointed as I thought you were white.

    • Replies: @JayMan
    , @JayMan
  38. JayMan says: • Website


    Nope. White chocolate butterscotch I’m afraid, like the little man:

  39. Priss Factor [AKA "The Priss Factory"] says:

    —As you can see from the national emblems above, I am a second generation Jamaican-American of Black, White (English), Indian (Asian), and Chinese descent, living the motto “out of many, one people.”—

    So, diversity is lost as different races merge into muddled ‘oneness’.

    Who needs that?

    10,000s of years in the making of different races lost by race-mixing into ‘oneness’.

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