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Alex Profile picture
@notcomplex_
Jun 21, 2025 • 2 tweets • 1 min read • Read on X
Biological children have incomes significantly more related to their parents than adoptees.

Here, the adoptees were randomly assigned, so it's interesting to see these effects. Image
doi.org/10.1162/qjec.1…Image

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More from @notcomplex_

Alex Profile picture
Jan 27
This is the most detailed study on personality and intelligence ever done:

First, the Big Five: Neuroticism is robustly associated with lower intelligence, particularly processing speed and quantitative ability. Image
Next Extraversion and Openness:

Extraversion itself has no correlation to intelligence (r= -0.02); however, activity and and enthusiauaim do—smarter people are more lively!

Openness has the strongest association of the five, its easy to see as 'ideas' correlates at r=0.4. Image
For Agreeableness and Conscientiousness, there are no broad associations; there are as many agreeable, intelligent people as there are disagreeable ones.

Though compassion and industriousness do have positive associations with intelligence! Image
Read 5 tweets
Alex Profile picture
Jan 19
A recent study found a latent correlation between IQ and Financial Literacy of r=0.76

This is "real life as an IQ test"; unfortunately, many have poor finances due to their intelligence.

A few example questions and the IQ they test for🧵 Image
Starting off easy, risk: This question best tests for an IQ of 70, and about 90% of people got it correct.

A minority of people don't understand even the basics of risk. Image
Next, diversification: This question best tests for an IQ of 91, and 61% of people got it correct.

Risk can get complicated, and for many, diversification is unintuitive. Image
Read 6 tweets
Alex Profile picture
Dec 30, 2025
Pit bulls are bred to be violent; this has inevitable costs on society.

What you might not expect is that activists and owners are working hard to socialize these costs.

A thread on a microcosm of fairness, "justice", and discrimination. 🧵 Image
Pit bulls are not like other dogs: they are bred to fight.

In the pit, dogs are expected to clash round after round. The first round begins with the dogs both released at once, they must race and attack the other—the round ends when the dog who is overpowered "Turns" away. Image
You would be forgiven to think that this is like boxing, where, after a number of rounds, a winner is decided, emphasizing strength and skill. This is NOT how dog fights are decided: the winner is selected by attrition or death.
Read 26 tweets
Alex Profile picture
Jun 12, 2025
Education doesn't raise intelligence

Here's how it works 🧵 Image
Above is the average genetic score of high school students, but I'll get to that later.

Below are the results of a meta-analysis on education. Here, education, using different methods, points to a 1-3 IQ point increase per additional year! Image
So there is certainly an effect! But let's put that into context: a 3 IQ point increase equals a Cohen's d of 0.2, or 1% of the variance.

1% isn't nothing, but look at what the rest shows us: the smartest students are considerably better, 3 IQ points is small in comparison. Image
Read 15 tweets
Alex Profile picture
Mar 15, 2025
Race isn't a social construct.

A brief explanation 🧵 Image
Social constructions can be found in many forms.

Take virginity, whether or not someone is a virgin isn't a social construct but some of its importance can be a social construct.
A pure social construct might be a playground game of tag where the players make up the rules, the outcomes, and the meaning.

Children quickly learn that the game is not about who can run the fastest but what the group decides.
Read 20 tweets
Alex Profile picture
Feb 17, 2025
McNamara’s Folly and The Denial of Individual Differences 🧵

The utmost importance of Intelligence in war, and the grim reality of what happened when the Military drafted over 300,000 low IQ men. Image
Robert McNamara, the eighth Secretary of Defense, was a genius.

At different points in his life was an Eagle Scout, the youngest and most highly paid assistant professor at Harvard Business School, and a president at Ford Motor Company. Image
He had mastered quantitative analysis by running the B-29 Bomber schedules and statistics in WWII and then later at Ford. In the 1960s, as Sec. of Defense he attempted to apply a similar process to the military.
Read 31 tweets

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