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Millions of people across the US use well water, but very few test it often enough to make sure it’s safe

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Serious water contaminants such as nitrate may not have any detectable taste or odor. Willie B. Thomas/Digital Vision via Getty Images

Gabriel Lade, Macalester College

About 23 million U.S. households depend on private wells as their primary drinking water source. These homeowners are entirely responsible for ensuring that the water from their wells is safe for human consumption.

Multiple studies show that, at best, half of private well owners are testing with any frequency, and very few households test once or more yearly, as public health officials recommend. Even in Iowa, which has some of the strongest state-level policies for protecting private well users, state funds for free private water quality testing regularly go unspent.

Is the water these households are drinking safe? There’s not much systematic evidence, but the risks may be large.

The U.S. Environmental Protection Agency still relies on a 15-year-old study showing that among 2,000 households, 1 in 5 households’ well water contained at least one contaminant at levels above the thresholds that public water systems must meet. While other researchers have studied this issue, most rely on limited data or data collected over decades to draw conclusions.

I’m an economist studying energy and agriculture issues. In a recent study, I worked with colleagues at Iowa State University, the University of Massachusetts Amherst and Cornell University to understand drinking water-related behaviors and perceptions of households that use private wells. We focused on rural Iowa, where runoff from agricultural production regularly contaminates public and private drinking water sources.

Diagram of a private well showing the aquifer below the home and pipes connecting the well to an indoor tank.
Basic components of a private water well. EPA

We found that few households followed public health guidance on testing their well water, but a simple intervention – sending them basic information about drinking water hazards and easy-to-use testing materials – increased testing rates. The burden of dealing with contamination, however, falls largely on individual households.

Nitrate risks

We focused on nitrate, one of the main well water pollutants in rural areas. Major sources include chemical fertilizers, animal waste and human sewage.

Drinking water that contains nitrate can harm human health. Using contaminated water to prepare infant formula can cause “blue baby syndrome,” a condition in which infants’ hands and lips turn bluish because nitrate interferes with oxygen transport in the babies’ blood. Severe cases can cause lethargy, seizures and even death. The EPA limits nitrate levels in public water systems to 10 milligrams per liter to prevent this effect.

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Studies have also found that for people of all ages, drinking water with low nitrate concentrations over long periods of time is strongly associated with chronic health diseases, including colorectal cancer and thyroid disease, as well as neural tube defects in developing fetuses.

Nitrate pollution is pervasive across the continental U.S. Fortunately, it is relatively easy to determine whether water contains unsafe nitrate concentrations. Test strips, similar to those used in swimming pools, are cheap and readily available.

US map showing high risk of nitrate contamination in drinking water in the Midwest and central Plains
Heavily agricultural areas are vulnerable to nitrate pollution in water, especially where aquifers are shallow. Areas at the highest risk of nitrate contamination in shallow groundwater generally have high nitrogen inputs to the land, well-drained soils and high ratios of croplands to woodlands. USGS

The water’s fine … or not

Mailing lists of households with private wells are hard to come by, so for our study we digitized over 22,000 addresses using maps from 14 Iowa counties. We targeted counties where public water systems had struggled to meet EPA safety standards for nitrate in drinking water, and where private wells that had been tested over the past 20 years showed nitrate concentrations at concerning levels.

We received responses from over half of the households we surveyed. Of those, just over 8,100 (37%) used private wells.

Map of Iowa with dots showing state findings for nitrate levels in private wells.
Nitrate measurements in domestic wells in Iowa from 2002 to 2022, from the Iowa Department of Natural Resources public water-testing program. Counties targeted in Lade et al.’s 2024 review are highlighted in red. Lade et al., 2024, CC BY-ND

Although the Centers for Disease Control and Prevention recommends testing annually for nitrate, just 9% of these households had tested their water quality in the past year.

More concerning, 40% of this group used their wells for drinking water, had not tested it in the past year, and did not filter the water or use other sources such as bottled water. They were drinking straight from the tap without knowing whether their water was safe.

Our survey also showed that, despite living in high-risk areas, 77% of households classified their well water quality as “good” or “great.” This may be driven by a “not in my backyard” mentality. Households in our survey were more likely to agree with the statement that nitrate is a problem in the state of Iowa than to perceive nitrates as a problem in their local area.

Climate change is likely to worsen nitrate contamination in well water. In regions including the Great Lakes basin, increases in heavy rainfall are projected to carry rising amounts of nutrients from farmlands into waterways and groundwater. https://www.youtube.com/embed/yDaaIo3JBNw?wmode=transparent&start=0 Nitrate contamination is often thought of as a rural problem, but in California it also has shown up in urban areas.

Providing information and tools helps

To see whether education and access to testing materials could change views about well water, we sent a mailer containing a nitrate test strip, information about risks associated with nitrate in drinking water, and contact information for a free water quality testing program run by the state of Iowa to a random 50% of respondents from our first survey. We then resurveyed all households, whether or not they received the mailer.

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Over 40% of households that received test strips reported that they had tested their water, compared with 24% of those that did not receive the mailer. The number of respondents who reported using Iowa’s free testing program also increased, from 10% to 13%, a small but statistically meaningful impact.

Less encouragingly, households that received the mailer were no more likely to report filtering or avoiding their water than those that did not receive the mailer.

Households bear the burden

Our results show that lack of information makes people less likely to test their well water for nitrate or other contaminants. At least for nitrate, helping households overcome this barrier is cheap. We asked respondents about their willingness to pay for the program and found that the average household was willing to pay as much as US$13 for a program that would cost the state roughly $5 to implement.

However, we could not determine whether our outreach decreased households’ exposure to contaminated drinking water. It’s also not clear whether people would be as willing to test their well water in states such as Wisconsin or Oregon, where testing would cost them up to a few hundred dollars.

As of 2024, just 24 states offered well water testing kits for at least one contaminant that were free or cost $100 or less. And while most states offer information about well water safety, some simply post a brochure online.

The upshot is that rural households are bearing the costs associated with unsafe well water, either through health care burdens or spending for treatment and testing. Policymakers have been slow to address the main source of this problem: nitrate pollution from agriculture.

In one exception, state agencies in southeastern Minnesota are providing free well water quality testing and offering a few households filtration systems in cases where their wells are laden with nitrate from local agricultural sources. However, this effort began only after environmental advocates petitioned the EPA.

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If state and federal agencies tracked more systematically the costs to households of dealing with contaminated water, the scale of the burden would be clearer. Government agencies could use this information in cost-benefit assessments of conservation programs.

On a broader scale, I agree with experts who have called for rethinking agricultural policies that encourage expanding crops associated with high nutrient pollution, such as corn. More restoration of wetlands and prairies, which filter nutrients from surface water, could also help. Finally, while the Environmental Protection Agency can’t force well owners to test or treat their water, it could provide better support for households when pollutants turn up in their drinking water.

Gabriel Lade, Associate Professor of Economics, Macalester College

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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The Bridge

The power of friendship: How a letter helped create an American bestseller about antisemitism

Laura Z. Hobson’s “Gentleman’s Agreement” explores antisemitism through reporter Phil Green’s experiences posing as Jewish, ultimately becoming a bestseller that sparked important conversations about prejudice in America.

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The novel about reporter Phil Green, which was soon made into a film, put prejudice and hypocrisy in the spotlight. John Springer Collection/Corbis via Getty Images

Rachel Gordan, University of Florida

Eighty years ago, the Jewish American novelist Laura Z. Hobson was contemplating her next writerly move and was seeking a little help from her friends.

Gentleman’s Agreement,” the story she was drafting, felt like a bold idea. Maybe too bold. In her vision for the novel, reporter Phil Green is assigned to write an article about antisemitism. He pretends to be Jewish so he can experience bigotry firsthand. Readers follow the character as he encounters the prejudice of supposedly good people and learns how to respond to the slights and jabs casually meted out even by Americans who consider themselves liberal.

It was 1944, three years after the United States joined World War II. What prompted Americans to finally fight, however, was the Japanese attack on Pearl Harbor, not Nazi persecution of Jews and other marginalized groups. Antisemitism in the U.S. remained rampant throughout the early and mid-1940s.

With so many fraught feelings about Jews, and about the war in which American soldiers were risking their lives, Hobson was unsure how a novel about domestic antisemitism would be received. She might have wondered if readers would dismiss the story as a Jewish writer’s “special pleading” on behalf of her own.

Should she move forward with the novel that was bubbling up inside of her? To find her way out of her writing quandary, Hobson did something she had never done before and would never do again in her four decades of writing more than a dozen books: She consulted several friends and colleagues, mailing them her proposal for the novel and a cover letter explaining her quandary.

She did not know it at the time, but Hobson was about to write her most important book – one that would help broaden conversation about prejudice by reaching many more readers than would ever hear a rabbi’s sermon or read a committee’s report on antisemitism.

A formally dressed woman with white hair poses, with her arms folded, in front of a marbled backdrop.
American novelist Laura Z. Hobson. Peter Jones/Corbis Historical via Getty Images

The right words

When the responses started to come in, it became clear that not all the feedback was of the helpful variety.

Lee Wright, Hobson’s editor at Simon & Schuster, seemed not to have fully grasped that writing fiction was a matter of placing oneself in the shoes of someone else. The editor advised Hobson that she was ill-suited to write from a gentile’s perspective because Hobson herself was Jewish. Further, Wright cautioned, Hobson should not attempt to write from a man’s perspective.

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Hobson’s publisher and friend, Richard Simon of Simon & Schuster, was also skeptical. He did not believe that novels were the way to fight antisemitism or bigotry. And then Simon did that worst thing an editor could do: He reminded Hobson that her last novel, “The Trespassers,” had been a commercial disappointment.

Hobson stewed over these replies, as evident from her autobiography and letters archived at Columbia University, which I found while researching my first book, “Postwar Stories: How Books Made Judaism American.” As Hobson later noted in her autobiography, her publisher’s less-than-enthusiastic reply sapped some of her confidence. She wasn’t entirely certain that she wanted to continue with her writing.

It was one of Hobson’s closest female friends, Louise Carroll Whedon, whose letter offered just the right words of encouragement. Known as Carroll to her friends, she was married to TV writer John Whedon – and the family’s writing success would continue with their grandson Joss Whedon, of “Buffy the Vampire Slayer” and “The Avengers” fame.

Familiar with the ups and downs of the writing life, as well as Hobson’s insecurities, Carroll replied with the enthusiasm that Hobson needed. “Let me say right away that I think the book ought to be written,” Whedon assured her, “and the sooner the better – not to highlight the plight of the Jew, but to examine the even more appalling plight of the non-Jew, and what the seeping poison of prejudice can mean to America.”

The Americans who really needed “Gentleman’s Agreement,” Whedon argued, weren’t the extreme antisemites, but the people hoping that “if you just pretend it isn’t there, maybe it will go away.” Otherwise, she warned, that willful ignorance and passivity could destroy the country – “at least the America that most people want to believe exists.”

Whedon did not deny the risks. But she wasn’t willing to watch her friend doubt her abilities – or her insights as a Jewish woman who had experienced antisemitism firsthand, and observed casual antisemitism from her non-Jewish friends. That Whedon was one of Hobson’s non-Jewish friends made her enthusiasm for a novel about antisemitism especially valuable to Hobson.

“It’s a controversial subject, Babe, and there’ll be arguments who should do it and when and how it should be done no matter what comes of it,” Whedon concluded. “For me, I think you’re in a singularly good spot to write it – in hot anger, sure – but in cold truth as well.”

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Whedon had brought Hobson back to herself. Now, it was time to write.

Instant success

In a few years, the book stuck in Hobson’s mind would become a sensation. First published as a series in Cosmopolitan magazine, “Gentleman’s Agreement” was then printed by Simon & Schuster in 1947. It became a bestseller and later an Academy Award-winning film starring Gregory Peck.

“Required reading for every thoughtful citizen in this parlous century” was how The New York Times described the novel. Because of Hobson’s readable style and romance, the novel received attention from a wide range of publications, from the Saturday Review of Literature to Seventeen magazine. From books like Hobson’s, Americans were learning “how we could be humane, as well as human, beings,” Times reviewer Charles Poore wrote in a December 1947 roundup of the year’s top books.

A movie poster with actors' names and the title 'Gentleman's Agreement'
Within a year of the novel’s publication, it was adapted into an award-winning film. Twentieth Century–Fox Film Corp via Wikimedia Commons

“Gentleman’s Agreement” was never perceived as “just” a Jewish novel – mostly because readers mistakenly assumed an author named Hobson was not Jewish. Even for critics, the book broadcast a new openness toward discussing antisemitism. It was a story full of teachable moments.

Hobson’s novel was part of a wave of 1940s fiction against antisemitism. Some of these novels were written by Jewish authors who were beginning to form the nucleus of postwar American literature, such as Saul Bellow and Arthur Miller. Others were by writers who made their mark during the 1940s, but whose names have faded over the decades, such as Gwethalyn Graham and Jo Sinclair. But Hobson’s was the most popular of its time.

If it weren’t for Whedon’s encouragement, though, “Gentleman’s Agreement” might never have been finished. If every friend of a writer said just the right thing – offering the needed encouragement or tough love – it would not feel like such profound treasure to spy a pearl of encouragement. But nobody gets all the encouragement they need, and writers are no exception.

Rachel Gordan, Assistant Professor of Religion and Jewish Studies, University of Florida

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Community

Larry Krasner, Kensington, the scrapped Sixers arena − and other key concerns that will shape Philly politics in 2025

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Philadelphia’s City Council approved the proposed Sixers arena on the last day of its 2024 legislative session. AP Photo/Matt Slocum

Richardson Dilworth, Drexel University

Campus protests. Homeless encampment clearings. Significant decreases in shootings, homicides and overdose deaths. Protests to “Save Chinatown.” A mass shooting at a SEPTA bus stop. Illegal car meetups. City workers called back to the office. A SEPTA strike averted.

These were just some of the headlines that dominated Philadelphia politics in 2024.

So, what does 2025 hold for the city?

I’m a politics professor at Drexel University and in 2023 I published a short book, “Reforming Philadelphia, 1682-2022,” that traced the city’s political development with an eye toward the future of its policy and politics.

Here are six key storylines that will shape Philly’s political landscape in 2025.

1. Partisan shifts

Philadelphia enters 2025 notably more politically diverse than five years ago.

Partisanship in Philadelphia is not so much captured by a Democratic-Republican split as it is by what local journalist Larry Platt once called “reformer vs. progressive,” referring to the division between more conservative Democrats on the one hand and more liberal Democrats and progressive third parties on the other.

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Progressive candidates have had minor surges in recent years. Seven of the 17 members of the Philadelphia City Council are elected at large, but no party is allowed to nominate more than five members to run for these seats in the general election. This has meant that, as long as anyone can remember, there have been five Democratic and two Republican at-large council members.

Then, in 2019, Working Families Party candidate Kendra Brooks won one of the two at-large seats previously held by Republicans. One year later, two Democratic Socialists who ran as Democrats, Nikil Saval and Rick Krajewski, were elected to the state Senate and state House, respectively. And in 2023 another Working Families Party member, Nicolas O’Rourke, won the second at-large City Council seat reserved for minor parties, thereby completely replacing Republicans in those positions.

At the same time, the mayor elected in 2023, Cherelle Parker, is a reasonably conservative Democrat – at least in the sense that her focus has not been on social justice issues but rather the classic municipal issues of cleanliness and public safety.

And the 2024 elections saw the GOP vote go up in Philadelphia, as it did almost everywhere in the country. Republicans captured a state Senate seat in the city for the first time in two decades.

The most recent surge favoring Republicans would ostensibly threaten the two at-large Working Families Party members of the City Council, who are most vulnerable to electoral challenges that would bring back at-large Republicans. However, they’re safe until 2027, by which time another Democratic surge in Philadelphia is likely, as many voters will have most likely soured on the Trump administration by that time.

Woman holds microphone while speaking at a podium in front of an ice cream truck
Kendra Brooks of the Working Families Party was elected to the Philadelphia City Council in 2019. Lisa Lake/Getty Images for MoveOn

2. Will Krasner stay or go?

In 2025, the most high-profile city election will be for district attorney, and that does seem potentially ripe for change.

The incumbent is Larry Krasner, first elected in 2017 as part of the post-Trump progressive wave. He won again decisively in 2021, against a challenger in the Democratic primary whose main support was from the Fraternal Order of Police.

Yet as Parker’s election as mayor – and Trump’s as president – suggests, Krasner may face an electorate ready for a more law-and-order message in May 2025. The DA’s office in Philadelphia has historically been a bastion for conservative Democrats and even Republicans. Krasner may face more significant challengers this time around, especially in the primary.

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Light shines on white man with grey hair walking with group of men in suits down a corridor while cameras film them
Philadelphia DA Larry Krasner is up for reelection in 2025. Kriston Jae Bethel/AFP via Getty Images

3. Kensington at a crossroads

Parker has benefited from the sharp decline in crime and violence after its pandemic-driven spike. But she has also increased the police budget to provide for hiring 400 new officers; hired a police commissioner from within, Kevin Bethel, who previously received praise for his work on diversion and juvenile justice; and focused on quality-of-life issues such as cracking down on ATV gangs.

Parker has also focused in particular on the Kensington neighborhood and its notorious open-air drug markets. This is important, not least because Kensington has been a large contributor to the city’s unfortunate status of being a leader in drug overdose deaths.

The drug trade was also holding down development and property values – and therefore property tax revenues – in a neighborhood on the path of gentrification. From my perspective, cleaning up Kensington promises to be some of the best return on investment in the city.

Seven police officers stand behind barrier gate under elevated train track
Police lock down part of Kensington Avenue during the clearing of a homeless encampment in May 2024. Spencer Platt/Getty Images

4. Parker vs. Trump administration

Of course, another new thing that the city will have to grapple with in 2025 is the incoming Trump administration.

The previous Trump administration got into a fight with then-Mayor Jim Kenney in 2016 over the city’s sanctuary policy with respect to federal immigration enforcement. Basically, the Kenney administration won and got back federal grant money that had been withheld.

Parker may be in a tough spot if she plans to maintain some sort of sanctuary status for the city. The Trump administration – no friend of Philadelphia under the best of circumstances – will likely face less resistance and some acquiescence, as we’re seeing in Chicago, where some aldermen have suggested getting rid of that city’s sanctuary status.

The incoming president has also signaled repeatedly his willingness to use the military for mass deportations, thereby sidestepping necessary cooperation from local law enforcement. This is a critical issue because immigration is a key economic asset for Philadelphia. As the Pew Charitable Trusts have found, immigrants in Philadelphia tend to be younger, more likely to participate in the workforce, and more likely to start a business than native Philadelphians.

Woman in red sweater speaks at podium
Philadelphia Mayor Cherelle Parker speaks ahead of a campaign rally for Democratic presidential candidate Kamala Harris in Philly in November 2024. Matthew Hatcher/AFP via Getty Images

5. Market East in limbo

And then there was the proposed downtown 76ers arena, approved by the City Council in a 12-5 vote in December 2024 and then entirely scrapped in early January 2025. Was this entire project simply some sort of bargaining chip used by Sixers owners and management to get a better deal in South Philadelphia from Comcast Spectacor, the owner of the teams’ current home at the Wells Fargo Center?

Whatever the case, the entire project no doubt leaves a bad taste in the mouths of the Chinatown businesses and other interest groups who opposed the new stadium and felt sold out by the mayor and City Council. But with the next City Council and mayoral elections not happening until 2027, it seems likely that the entire thing will be forgotten by the time any elected official might be punished at the polls.

The fall of the downtown stadium deal throws open the future of the Market Street East corridor. The proposed arena was part of a reimagining of the Fashion District, a redevelopment project by the Pennsylvania Real Estate Investment Trust that opened in 2019. The pandemic and higher interest rates led to store closures and financial problems, and PREIT has since filed twice for bankruptcy. Add to that the fact that Macy’s, an anchor tenant on the corridor, announced it is closing its store in the historic Wanamaker Building next to City Hall.

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Market East – essentially the front door of the city – doesn’t look so good for the 2026 celebrations planned as part of the 250th anniversary of the founding of the country. Indeed, the Constitution was drafted at Independence Hall, which is part of the Market East corridor. The chances that things will look much better in 2025 seem pretty dim, although there are plans to convert the space to apartments and smaller stores.

Other major infrastructure projects will likely work in the mayor’s favor, most notably a new park covering part of I-95 that will reconnect the Delaware riverfront to the Society Hill and Old City neighborhoods. This is set to be completed during Parker’s first term.

Large development under construction on urban corridor
Philadelphia is in the midst of a building boom, but affordable housing remains a concern for many residents. Jeff Fusco for The Conversation U.S., CC BY-NC-SA

6. Inflation and housing

And finally, one of the bigger issues in the last presidential election was the housing affordability crisis. This crisis is slightly muted in Philadelphia compared with some other major cities, but it is real nonetheless.

Yet the city has to a certain extent inadvertently lucked out. As 2021 was the last year that developers could take full advantage of the city’s 10-year tax abatement for new construction, a record number of building permits were granted that year.

In 2022, the number of building permits plummeted to 2013 levels. Nevertheless, the permits from 2021 have led to a building boom, especially in residential construction, which may be keeping housing prices lower than they would otherwise be. We can expect this trend to continue into 2025, even if the volume of new permits drops even more.

Richardson Dilworth, Professor of Politics, Drexel University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Race Relations

Mass deportations don’t keep out ‘bad genes’ − they use scientific racism to justify biased immigration policies

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Anti-immigration policies were a key talking point for Republican candidates. Matt Rourke/AP Photo

Shoumita Dasgupta, Boston University

Threats of mass deportations loom on the post-2024 election horizon. Some supporters claim these will protect the country from immigrants who bring “bad genes” into America. But this is a misguided use of the language of science to give a sheen of legitimacy to unscientific claims.

Politicians invoke genetics to confirm false stereotypes that immigrants are more violent than native-born citizens as a result of biological differences. This is despite the fact that immigrants living in the country with or without legal authorization have significantly lower crime and violent crime rates than U.S. citizens. Moreover, there is no strong genetic evidence to support a biological predisposition for committing violent acts.

As a geneticist and a child of immigrants, I study the intersection of biology and bias. I am also author of the book “Where Biology Ends and Bias Begins: Lessons on Belonging from Our DNA.” What is clear from my professional work is that this line of thinking – attempting to use science to explain human difference in ways that reinforce social hierarchies – isn’t new. It takes the playbooks of genetic essentialism and scientific racism and applies them to public policy.

The fallacy of genetic essentialism

Genetic essentialism is the concept that genes alone are the reason why someone develops a specific trait or behaves a certain way. For instance, a genetic essentialist would say that a person’s athleticism, intelligence, personality and a range of other traits are encoded entirely in their DNA. They ignore the influence that sports training, material resources and learned behaviors have on these traits.

When used to explain differences between populations, genetic essentialism discounts the role that structural biases – inequities deeply ingrained in how systems operate – play in individual differences. Structural biases create a playing field that advantages one group over another from the start.

For instance, studies seeking to identify a gene for violent behavior may use measurements that are themselves biased. If arrest or incarceration rates were used as evidence of violence, study findings would be affected by discriminatory practices in the policing and criminal justice systems that more harshly penalize people of color.

Studies trying to disentangle the relative effects of genetic and structural factors on specific traits also face similar biases. For example, mental health outcomes are influenced by the identity-related stress that racial or sex and gender minorities experience. Similarly, socioeconomic outcomes are affected by the effects of redlining and segregation on generational wealth.

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Genetics of educational attainment

As another example of behavioral genetics, consider a 2018 study on the genetics of educational attainment – in other words, whether certain genes were associated with years of schooling completed. The researchers were careful to communicate their results as pertaining specifically to educational attainment. They highlighted that genetic scores explained only about 11% to 13% of the variance – meaning, 87% to 89% of differences in educational attainment were due to influences other than genetics.

However, some popular press coverage oversimplified their findings as identifying genes for intelligence, even though the scientists did not directly measure intelligence – nor is it possible to.

Teacher reading a book to a group of children
The effects of racial segregation in schools continues to be reflected in educational attainment gaps. Wilfredo Lee/AP Photo

Educational attainment can reflect everything from generational wealth to racial biases in education. A student with access to tutors their parents paid for has fewer educational obstacles than a student who has to work after school to make ends meet. Likewise, school punishment practices that are biased against students from certain backgrounds can set them on a harmful trajectory known as the school-to-prison pipeline.

Genetic studies are not conducted in a vacuum, and social influences can confound analyses seeking to focus on biological effects. In fact, some scientists think of genes as potential controls to allow more careful study of the nongenetic factors accounting for the remaining 87% to 89% of differences in educational attainment.

Intentional misinterpretation of these observations on educational attainment have led some to conclude that Black students are simply not as intelligent as their white counterparts. They argue that these differences are genetically encoded and immutable. However, when the effects of wealth gaps and school segregation are accounted for, test score gaps substantially narrow. Importantly, educational attainment gaps actually invert, predicting that Black students complete more years of school than white students.

Slipping to scientific racism

This brings us to scientific racism: the way in which science is contorted to support preexisting views about the superiority of the white race over all others.

American physician Samuel Morton was one of the original forebears of scientific racism. He was interested in providing “evidence” to support his belief that Caucasians were the most intelligent of all races. To do this, he collected skulls and categorized them into five racial groupings he believed were derived from separate creation events. He measured skull volume as an indicator of intelligence.

Illustration depicting four different skulls
Samuel Morton and his colleagues used average skull volume to support their theory of white supremacy. Morton et al/U.S. National Library of Medicine via Internet Archive

When comparing the averages from each group, his results supported his original theory. However, if he had instead focused on the array of skull volumes in his collection, he would have seen substantial overlap in each of the groupings. That is, each group had a range of small to large skulls. Morton’s singular focus on proving his beliefs from the outset likely influenced his favored analytical approach. Nor is there a meaningful correlation between brain volume and intelligence.

Similar beliefs are at play when white supremacists manipulate data to create a scientific basis for their claims that white people are more intelligent than Black people. These tampered results appear in dark corners of the internet where they are shared in fringe journals, far-right social media memes and racist manifestos.

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To be clear, there is no evidence that genetic differences related to intelligence or cognitive performance exist between racial groups. Instead, this is another argument growing out of replacement theory, the conspiracy theory that Jews and Western elites are deliberately replacing white populations with populations of color. Adherents believe that people of color are genetically inferior but are reproducing and immigrating at greater rates, and so threatening white power.

Human genetic variation

Scientists have systematically studied human genetic variation for decades, looking at differences in the DNA of people around the world. These studies definitively demonstrate that we are far more alike than different. The vast majority of common genetic variation is found across populations, and very few rare variants are specific to an individual group.

This may seem unexpected. Looking at the world around you, you’ll observe some differences between racially defined groups, such as skin tone and hair texture. However, there is no place in the world where you’ll be able to draw a line that cleanly separates people with dark skin tone from those with light skin tone. Skin color varies continuously across the globe, and a range of skin tones are present within any individual group.

Importantly, variation in one genetic trait is not predictive of other genetic traits. That is, you can’t extrapolate conclusions about traits such as disease predisposition from the genes that influence skin color. Even if the fallacy of genetic essentialism were true and cognitive ability was primarily a biological trait – which it is not – it would not be possible to connect an observed skin tone to predicted intelligence. https://www.youtube.com/embed/wK94PWbCmsk?wmode=transparent&start=0 President-elect Donald Trump pledged to use the military to carry out mass deportations.

Misappropriating genetics

While science does not support genetic essentialism or other underpinnings of replacement theory, this exact rationale has made its way into national immigration policy.

These policies grew directly out of the American eugenics movement, which sought to build a supposedly better human race through social engineering based on “race science.” Zoologist Charles Davenport created the Cold Spring Harbor Eugenics Record Office in 1910 to pursue his interests in evolution, breeding and human heredity. There, he and his colleagues collected records of American families, documenting their traits and ascribing genetic bases to them.

Harry Laughlin, a high school teacher Davenport recruited to serve as superintendent of the office, was later appointed as the expert eugenics agent for the U.S. congressional Committee on Immigration and Naturalization. He commissioned studies to document race-based trends in so-called biological traits such as intelligence, inventiveness and feeble-mindedness, erroneously concluding that observed patterns were due to genetic differences between populations. His findings were used to inform U.S. immigration quotas, which were set higher for populations deemed to have good genes and lower for those with undesirable traits.

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These policies were codified in the Immigration Restriction Act of 1924. In signing the act, President Calvin Coolidge declared, “America must remain American,” paraphrasing a popular Ku Klux Klan slogan. This law severely restricted immigration from Asia and implemented strict quotas for immigrants from Southern and Eastern Europe. It also established elements of immigration that remain in 2025, including the visa system and the Border Patrol. With the passage of the Immigration Restriction Act, anti-Semitism and xenophobia became law of the land.

Coming full circle, genetic essentialism and racism continue to drive present-day rhetoric using “bad genes” to justify mass deportations of people deemed harmful to American society. Politicians and tech moguls are employing a combination of racism, willful misunderstanding of genetic science and political power to promote their own social agendas.

Person gazing at makeshift memorial at the foot of a tree, police cars in the background, and nonviolence signs in the foreground
Ten people were killed in the 2022 Buffalo shooting. Kent Nishimura/Los Angeles Times via Getty Images

Politicians and hate groups have often weaponized genetics, leading to violent events carried out in the name of white supremacy. These include the 2017 Charlottesville Unite the Right rally, the 2019 Christchurch shootings of Muslims at two mosques, and the 2022 Buffalo massacre of Black customers at a neighborhood grocery store.

A better understanding of science and history can empower scientists, policymakers and others to reject unscientific claims and protect vulnerable members of society targeted by racism.

Shoumita Dasgupta, Professor of Medicine, Assistant Dean of Diversity & Inclusion, Boston University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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