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Fewer Americans Are Buying Guns Without Background Checks Than Previously Thought

Mother Jones

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Is the case for background checks for gun buyers gaining momentum? In a study published in the Annals of Internal Medicine on Tuesday, public health researchers from Harvard and Northeastern universities found that 22 percent of all gun sales in the past two years around the United States were conducted without background checks—nearly half as many as previously thought. The new study asked 1,613 gun owners about when and where they acquired their most recent firearm, and whether they were asked to show a firearm license or permit, or to pass a background check. (The researchers note that the self-reporting study may have limitations, as it is based on the respondents’ memory rather than documentation.) The study is the first national survey of its kind since 1994, when an extrapolation from a survey of 251 gun owners estimated that 40 percent of all guns sales occurred without any background checks.

Yet, despite the lower percentage shown by the research, many Americans continue to purchase guns through so-called private sales with no official scrutiny: According to the study, 50 percent of people who purchased firearms online, in person from an individual, or at gun shows did so without any screening. That occurs most often in states with looser regulations on sales, where 57 percent of gun owners reported buying guns without background checks, compared to 26 percent in the 19 states that now mandate universal background checks.

The decades-old 40-percent figure was long a point of contention in the gun debate, criticized by gun groups as false (the NRA called it a “lie”), yet also widely cited among researchers and policymakers in the absence of any updated studies.

Despite a lack of federal legislation regulating private gun sales, the study’s authors suggest that state and local efforts to mandate universal background checks are making progress. And Philip Cook, a Duke University gun violence researcher who conducted the 1994 survey, told The Trace that the new results should be encouraging for advocates of stricter gun laws. “The headline is that we as a nation are closer to having a hundred percent of gun transactions with a background check than we might have thought,” he said. Referencing his previous survey, he noted that the updated figures mean “it’s more attainable, and cheaper, to pass a universal requirement than it would be if 40 percent of transactions were still being conducted without these screenings.”

Studies have shown that background checks can help curb gun violence, as well as limit interstate gun trafficking; it’s been well documented that guns originating in states with lax gun regulations inundate states with tougher laws and fuel gun crime. But even with a solid majority of Americans now undergoing background checks, the researchers note that millions of Americans continue to acquire guns free of any government oversight.

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Fewer Americans Are Buying Guns Without Background Checks Than Previously Thought

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Study: Air Pollution May Make Your Brain Age Faster

Mother Jones

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If you want to prevent cognitive decline with old age, doctors have long recommended eating well, getting enough rest, exercising, reading plenty of books, and staying socially active. Pretty soon, they might start recommending a move out to the countryside.

Living in places with high levels of air pollution, such as cities and along busy highways, may accelerate aging of the brain. In a new study published in the Annals of Neurology, researchers found that over time, increased exposure to air pollution in a group of elderly women without dementia led to significant decreases in their brains’ white matter, which is important for cognition.

The researchers, led by Dr. Jiu-Chiuan Chen of the University of Southern California, looked in particular at exposure to fine particles, which can come from fires, coal-fired power plants, agricultural and industrial emissions, and especially cars and trucks. These particles, which are about 36 times finer than a grain of sand, can enter the lungs and travel into the bloodstream, causing serious damage to the body. The researchers estimated air pollution exposure for a group of 1,403 elderly women from 1999 to 2006, and found that those who were exposed to an increase of 3.49 micrograms of fine particles per cubic meter of air—similar to the increase in pollution you’d get by moving right next to a busy road—experienced a decrease in white matter volume as if their brains had aged an extra one or two years.

These findings support a growing body of new evidence—uncovered today in a Mother Jones investigation by Aaron Reuben—that suggests air pollution’s assault on the body goes much deeper than we previously believed. While scientists have long understood that exposure to fine particles is linked with increased risk of heart attack, stroke, and other cardiovascular diseases, as well as respiratory illnesses and cancers, they are only just beginning to suspect that this type of pollution may also be leading to or exacerbating degenerative diseases like Alzheimer’s and Parkinson’s.

As Reuben reports, when we inhale fine particles, they can actually travel along a pathway from our noses directly into our brains. This results in inflammation, the body’s natural response to pathogens that, over time, can lead to a wide range of chronic diseases. Over the past decade or so, a number of studies, controlling for things like ethnicity, income, education, and other environmental factors, have shown that elderly people living in polluted places seem to lose their mental abilities faster, show more predementia symptoms, and develop Alzheimer’s disease at greater rates than those who breathe cleaner air. Even children in polluted places have shown signs of brain trauma. To learn more about the terrifying new science behind these findings, check out Reuben’s full investigation here.

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Study: Air Pollution May Make Your Brain Age Faster

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