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Was it a stone tool or just a rock? An archaeologist explains how scientists can tell the difference

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theconversation.com – John K. Murray, Ph.D. Candidate in Anthropology, Institute of Human Origins, Arizona State University – 2025-05-07 07:35:00



An archaeologist explains how scientists distinguish between stone tools and ordinary rocks, focusing on the process of flintknapping. This technique, dating back over 3 million years, involves creating sharp tools by fracturing stones, primarily through percussion or pressure. Archaeologists identify stone tools by signs like flake scars and the bulb of percussion, features resulting from deliberate human activity. Rocks that exhibit these traits are unlikely to be naturally formed. Additionally, the context of the stone’s discovery, such as its material or the presence of other similar tools, helps determine whether it was crafted.

Stone tools are deliberately made by the hands of hominins, like these worked on by the author.
John K. Murray

John K. Murray, Arizona State University

Have you ever found yourself in a museum’s gallery of human origins, staring at a glass case full of rocks labeled “stone tools,” muttering under your breath, “How do they know it’s not just any old rock?”

At first glance, it might seem impossible to decipher. But as an experimental archaeologist with over a decade of experience studying and manufacturing stone tools, I can say that there are telltale signs that a rock has been modified by humans or our very ancient ancestors, hominins.

This process, known as flintknapping, can be boiled down to mastering force, angles and rock structure. When done properly, flintknapping creates the recognizable features that archaeologists use to identify stone tools.

YouTube video
A demonstration of traditional flintknapping techniques.

Why do stone tools matter?

Man seated on a bucket holds stones in his hands, with leather covering his thigh
John Murray demonstrates his flintknapping skills for the Glendale Community College Anthropology Club.
John K. Murray

Stone tools are rocks that have been selected for use or intentionally altered. This technology appeared around 3.3 million years ago and became essential to hominins – all the living and extinct species that belong to the human lineage. Currently, we Homo sapiens are the only living hominin.

We are not the only living species to make and use stone tools, though – many other primates do – but the extent to which hominins modify them is unparalleled in the animal kingdom. Monkeys and other apes may hold a large stone in their hands to crack a nut on a flat, tablelike stone.

But most hominins don’t rely on stones collected as-is. They modify and shape them into useful tools for a variety of tasks, including cutting meat or plants, woodworking, scraping hide and even as projectiles.

Stone tools are important to archaeologists because they are durable and preserve well. This makes them some of the best evidence for hominin behavior and allows us to better understand how different populations adapted to local environments across time and large geographic regions.

How are stone tools made?

Hominins manufacture stone tools by fracturing or abrading rock. Here, I am going to focus on fractured or flaked stone technology because tools made through this technique dominate the archaeological record.

The process of flaking involves applying force to the edge of a stone, known as the striking platform, through percussion or pressure to remove portions of the rock, which are called flakes. With some guidance from a teacher and plenty of practice, flintknappers can learn how to identify a promising platform on a chunk of stone, called a core, and consistently remove flakes from it. When struck, the platform is removed from the core and is a key feature of the flake.

Flakes offer an immediate sharp cutting edge. A flintknapper can also further modify them into more specific shapes for other uses. An iconic example of this is the hand ax, which is a core that’s been flaked into a teardrop shape.

Variety of stones that have had pieces removed by force or that are the removed pieces
Cores, left, are the object being struck by the flintknapper, and flakes, right, are the sharp-edged material removed from the core. Some cores, like this one from the archaeological site Pinnacle Point 5-6 in South Africa, can be as small as the tip of a finger.
John K. Murray

We often use hammerstones or large pieces of antler, called billets, to strike the core’s edge. Repetitive flaking not only allows a flintknapper to produce a significant amount of sharp cutting edge in the form of flakes, but gives them the ability to shape the core to their desired form … often with the risk of personal injury along the way. My fingers can attest to this!

Flintknapper's toolkit.
A modern flintknapper’s toolkit consists of leather pads, gloves, safety glasses, antler billets (left), hard hammerstones (right), and abraders (center-right with grooves), used to rub the edge of the stone to strengthen the platform before striking.
John K. Murray

However, not every type of rock has the characteristics needed to be flaked into a tool. You want the stone to exhibit what’s called conchoidal fracture. If you’ve ever seen glass break, you’ve witnessed conchoidal fracture. This smooth break, with concentric wavelike ripples, is defined by the physics of how force moves through different materials.

Shiny brown pointed stone tool with arrows pointing to conchoidal fracture sites along its edge
Obsidian hand ax made by John Murray, showcasing examples of conchoidal fracture produced while making flakes to shape it.
John K. Murray

When an experienced knapper is preparing to remove a flake, we understand how the material we’re working will break when we strike it, so we can predict the shape and size of the tools that we are producing. A stone like obsidian, which is volcanic glass, is the poster child for conchoidal fracture.

Of course, there is a lot of variation in the quality of rock that hominins have used for manufacturing stone tools, and many have made use of lesser quality stone. Even some of the earliest toolmakers were preferentially selecting rocks for certain properties, such as durability.

How can you recognize stone tools?

You may hear people saying that rocks that they found in their garden were tools because they “fit perfectly in the hand” or are “tool shaped.” But it’s not quite that straightforward. Although shape and function may play a role in the final product of a stone tool, it is not the smoking gun.

Archaeologists can determine whether a chunk of rock is a stone tool based on clues left behind from the process of conchoidal fracture during flintknapping.

One such clue is the presence of flake scars, or what we call negative removals, which can be found on both cores and flakes. These have characteristic ridges on one or more sides of the rock that outline previous flake removals – hence the use of the term scar.

When we see multiple flake scars that are consistent in their orientation and size as opposed to being random, it is likely the stone in question was deliberately worked on by a hominin.

The second feature is what we call the bulb of percussion. This is a bulge in the flake, just below the striking platform, that results from the concentration of force when the knapper struck it.

Considering that producing a bulb of percussion requires the rock to be struck on a platform at a specific angle with enough force to detach it from the stone, it is improbable that this feature would be created through natural processes – but not impossible. Scientists have found naturally produced sharp stone fragments, or naturaliths, all over the world, even in Antarctica.

However, when a lot of flakes with these diagnostic characteristics are found together, it’s unlikely they were created naturally.

Black outlines surround the places flakes were removed from a teardrop-shaped hand ax. Three examples of a bulge on the flake near where it was struck.
A hand ax made by John Murray shows many flake scars, some of which are outlined in black. The inner surface of three flakes shows the bulb of percussion just below the platform.
John K. Murray

The final thing to consider when determining whether a rock is a stone tool is the context in which it was found. Are there many stones in the area that exhibit the characteristics that we look for when trying to identify a stone tool? Is the stone tool made of an exotic material, or is it like the rest of the rocks near it?

If you find a lot of stone tools in the same area made from one type of rock, you might have stumbled across an ancient flintknapping workshop. However, if you discover a tool that was made from a type of stone that can only be found hundreds of miles away, maybe someone traded for this material or carried it with them.

Try it for yourself

I think the best way for you to be able to learn to recognize whether a chunk of stone was a tool or just a rock is to try flintknapping yourself. I have taught more than 100 people of all ages to manufacture stone tools, and most agree: It is harder than you’d think.

This experience puts you into the minds of our hominin ancestors, trying to tackle one of the earliest problems our lineage faced: getting a sharp edge from a chunky piece of rock.The Conversation

John K. Murray, Ph.D. Candidate in Anthropology, Institute of Human Origins, Arizona State University

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

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Note: The following A.I. based commentary is not part of the original article, reproduced above, but is offered in the hopes that it will promote greater media literacy and critical thinking, by making any potential bias more visible to the reader –Staff Editor.

Political Bias Rating: Centrist

The content is a factual, educational article focused on the archaeological and anthropological study of stone tools and human origins. It presents scientific information in an objective manner without promoting any political ideology or partisan viewpoints. The tone is neutral and aimed at informing a general audience about human history and tool-making processes, making it politically non-aligned and centrist in nature.

The Conversation

Science requires ethical oversight – without federal dollars, society’s health and safety are at risk

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theconversation.com – Christine Coughlin, Professor of Law, Wake Forest University – 2025-05-09 07:51:00


Federal cuts to research funding under the Trump administration threaten both scientific progress and ethical oversight in biomedical research. The National Institutes of Health (NIH) has been pivotal in supporting innovations such as cancer treatments, but cuts and hiring freezes have led to suspended clinical trials and delayed studies. Ethical concerns surrounding emerging biotechnologies like brain organoids underscore the importance of federal research infrastructure in safeguarding scientific integrity. This oversight is vital to prevent exploitation, ensure voluntary consent, and protect participants from harm, maintaining global leadership in biomedical research. The article calls for continued support to sustain medical advancements and safeguard public health.

Brain organoids, pictured here, raise both many medical possibilities and ethical questions.
NIAID/Flickr, CC BY-SA

Christine Coughlin, Wake Forest University and Nancy M. P. King, Wake Forest University

As the Trump administration continues to make significant cuts to NIH budgets and personnel and to freeze billions of dollars of funding to major research universities – citing ideological concerns – there’s more being threatened than just progress in science and medicine. Something valuable but often overlooked is also being hit hard: preventing research abuse.

The National Institutes of Health has been the world’s largest public funder of biomedical research. Its support helps translate basic science into biomedical therapies and technologies, providing funding for nearly all treatments approved by the Food and Drug Administration from 2010 to 2019. This enables the U.S. to lead global research while maintaining transparency and preventing research misconduct.

While the legality of directives to shrink the NIH is unclear, the Trump administration’s actions have already led to suspended clinical trials, institutional hiring freezes and layoffs, rescinded graduate student admissions, and canceled federal grant review meetings. Researchers at affected universities say that funding will delay or possibly eliminate ongoing studies on critical conditions like cancer and Alzheimer’s.

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The Trump administration has deeply culled U.S. science across agencies and institutions.

It is clear to us, as legal and bioethics scholars whose research often focuses on the ethical, legal and social implications of emerging biotechnologies, that these directives will have profoundly negative consequences for medical research and human health, with ripple effects that will last decades. Our scholarship demonstrates that in order to contribute to knowledge and, ultimately, to biomedical treatments, medical research at every stage depends on significant infrastructure support and ethical oversight.

Our recent focus on brain organoid research – 3D lab models grown from human stem cells that simulate brain structure and function – shows how federal support for research is key to not only promote innovation, but to protect participants and future patients.

History of NIH and research ethics

The National Institutes of Health began as a one-room laboratory within the Marine Hospital Service in 1887. After World War I, chemists involved in the war effort sought to apply their knowledge to medicine. They partnered with Louisiana Sen. Joseph E. Ransdell who, motivated by the devastation of malaria, yellow fever and the 1928 influenza pandemic, introduced federal legislation to support basic research and fund fellowships focusing on solving medical problems.

By World War II, biomedical advances like surgical techniques and antibiotics had proved vital on the battlefield. Survival rates increased from 4% during World War I to 50% in World War II. Congress passed the 1944 Public Health Services Act to expand NIH’s authority to fund biomedical research at public and private institutions. President Franklin D. Roosevelt called it “as sound an investment as any Government can make; the dividends are payable in human life and health.”

As science advanced, so did the need for guardrails. After World War II, among the top Nazi leaders prosecuted for war crimes were physicians who conducted experiments on people without consent, such as exposure to hypothermia and infectious disease. The verdicts of these Doctors’ Trials included 10 points about ethical human research that became the Nuremberg Code, emphasizing voluntary consent to participation, societal benefit as the goal of human research, and significant limitations on permissible risks of harm. The World Medical Association established complementary international guidelines for physician-researchers in the 1964 Declaration of Helsinki.

White researcher injecting a Black participant in the Tuskegee Study with a syringe
At least 100 participants died in the Tuskegee Untreated Syphilis Study.
National Archives

In the 1970s, information about the Tuskegee study – a deceptive and unethical 40-year study of untreated syphilis in Black men – came to light. The researchers told study participants they would be given treatment but did not give them medication. They also prevented participants from accessing a cure when it became available in order to study the disease as it progressed. The men enrolled in the study experienced significant health problems, including blindness, mental impairment and death.

The public outrage that followed starkly demonstrated that the U.S. couldn’t simply rely on international guidelines but needed federal standards on research ethics. As a result, the National Research Act of 1974 led to the Belmont Report, which identified ethical principles essential to human research: respect for persons, beneficence and justice.

Federal regulations reinforced these principles by requiring all federally funded research to comply with rigorous ethical standards for human research. By prohibiting financial conflicts of interest and by implementing an independent ethics review process, new policies helped ensure that federally supported research has scientific and social value, is scientifically valid, fairly selects and adequately protects participants.

These standards and recommendations guide both federally and nonfederally funded research today. The breadth of NIH’s mandate and budget has provided not only the essential structure for research oversight, but also key resources for ethics consultation and advice.

Brain organoids and the need for ethical inquiry

Biomedical research on cell and animal models requires extensive ethics oversight systems that complement those for human research. Our research on the ethical and policy issues of human brain organoid research provides a good example of the complexities of biomedical research and the infrastructure and oversight mechanisms necessary to support it.

Organoid research is increasing in importance, as the FDA wants to expand its use as an alternative to using animals to test new drugs before administering them to humans. Because these models can simulate brain structure and function, brain organoid research is integral to developing and testing potential treatments for brain diseases and conditions like Alzheimer’s, Parkinson’s and cancer. Brain organoids are also useful for personalized and regenerative medicine, artificial intelligence, brain-computer interfaces and other biotechnologies.

Brain organoids are built on knowledge about the fundamentals of biology that was developed primarily in universities receiving federal funding. Organoid technology began in 1907 with research on sponge cells, and continued in the 1980s with advances in stem cell research. Since researchers generated the first human organoid in 2009, the field has rapidly expanded.

Fluorescent dots forming the outline of a sphere
Brain organoids have come a long way since their beginnings over a century ago.
Madeline Andrews, Arnold Kriegstein’s lab, UCSF, CC BY-ND

These advances were only possible through federally supported research infrastructure, which helps ensure the quality of all biomedical research. Indirect costs cover operational expenses necessary to maintain research safety and ethics, including utilities, administrative support, biohazard handling and regulatory compliance. In these ways, federally supported research infrastructure protects and promotes the scientific and ethical value of biotechnologies like brain organoids.

Brain organoid research requires significant scientific and ethical inquiry to safely reach its future potential. It raises potential moral and legal questions about donor consent, the extent to which organoids should be grown and how they should be disposed, and consciousness and personhood. As science progresses, infrastructure for oversight can help ensure these ethical and societal issues are addressed.

New frontiers in scientific research

Since World War II, there has been bipartisan support for scientific innovation, in part because it is an economic and national security imperative. As Harvard University President Alan Garber recently wrote, “[n]ew frontiers beckon us with the prospect of life-changing advances. … For the government to retreat from these partnerships now risks not only the health and well-being of millions of individuals but also the economic security and vitality of our nation.”

Cuts to research overhead may seem like easy savings, but it fails to account for the infrastructure that provides essential support for scientific innovation. The investment the NIH has put into academic research is significantly paid forward, adding nearly US$95 billion to local economies in fiscal year 2024, or $2.46 for every $1 of grant funding. NIH funding had also supported over 407,700 jobs that year.

President Donald Trump pledged to “unleash the power of American innovation” to battle brain-based diseases when he accepted his second Republican nomination for president. Around 6.7 million Americans live with Alzheimer’s, and over a million more suffer from Parkinson’s. Hundreds of thousands of Americans are diagnosed with aggressive brain cancers each year, and 20% of the population experiences varying forms of mental illness at any one time. These numbers are expected to grow considerably, possibly doubling by 2050.

Organoid research is just one of the essential components in the process of learning about the brain and using that knowledge to find better treatment for diseases affecting the brain.

Science benefits society only if it is rigorous, ethically conducted and fairly funded. Current NIH policy directives and steep cuts to the agency’s size and budget, along with attacks on universities, undermine globally shared goals of increasing understanding and improving human health.

The federal system of overseeing and funding biomedical science may need a scalpel, but to defund efforts based on “efficiency” is to wield a chainsaw.The Conversation

Christine Coughlin, Professor of Law, Wake Forest University and Nancy M. P. King, Emeritus Professor of Social Sciences and Health Policy, Wake Forest University

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

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Note: The following A.I. based commentary is not part of the original article, reproduced above, but is offered in the hopes that it will promote greater media literacy and critical thinking, by making any potential bias more visible to the reader –Staff Editor.

Political Bias Rating: Center-Left

This content reflects a center-left perspective by critically examining the Trump administration’s significant cuts to NIH funding and their potentially harmful effects on medical research and ethical oversight. The article emphasizes the importance of federal support for scientific innovation and ethical standards in biomedical research, portraying the administration’s actions as detrimental. While it acknowledges bipartisan support for science historically, it frames recent conservative-led policies as undermining scientific progress and public health. The tone and focus align with a viewpoint that supports government investment in science and regulation to protect ethical standards.

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Nitrous oxide recreational use is linked to brain damage and sudden death − but ‘laughing gas’ is still sold all over the US

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theconversation.com – Andrew Yockey, Assistant Professor of Public Health, University of Mississippi – 2025-05-09 07:48:00



Nitrous oxide, commonly known as laughing gas, is increasingly being used recreationally, especially among young people, despite its potentially deadly effects. The gas is sold in cartridges, often under names like “Galaxy Gas” and “Miami Magic,” and is available in stores and online. Frequent use can cause severe health issues, such as cognitive impairment, memory loss, and irreversible brain damage. The number of deaths linked to nitrous oxide abuse has more than doubled in recent years. Despite its dangers, nitrous oxide remains unregulated in many areas, with some states enacting restrictions or bans on its recreational use. Research and prevention efforts are essential to curbing the rise in misuse.

Nitrous oxide is often inhaled with a balloon.
Matt Cardy/Getty Images News

Andrew Yockey, University of Mississippi

The U.S. Food and Drug Administration is warning Americans about the ever-increasing and potentially deadly recreational use of nitrous oxide products, particularly among young people.

Marketed with names like “Galaxy Gas” and “Miami Magic,” and often sold in steel cartridges known as “whippets,” these products are cheap and readily available at gas stations, convenience stores, smoke shops and major retail outlets, including Walmart. They’re also sold online.

As an assistant professor of public health who studies these products, I’m aware of how dangerous they can be.

Recreational and continued use of nitrous oxide can cause a wide range of serious health problems, and in some cases, death.

A long list of potential harms

The list of serious side effects from frequent use is long. It includes: cognitive impairment, memory problems, hallucinations, headaches, lightheadedness, mood disturbances, blood clots, limb weakness, trouble walking, peripheral neuropathy, impaired bowel or bladder function, spinal cord degeneration and irreversible brain damage. Vitamin B-12 deficiency is common and can lead to nerve and brain damage.

Deaths in the U.S. attributed to abuse of nitrous oxide jumped more than 100% between 2019 and 2023; over a five-year period, emergency department visits rose 32%.

All told, more than 13 million Americans have misused nitrous oxide at least once during their lifetimes. This includes children: In 2024, just over 4% of eighth graders and about 2% of 12th graders said they’ve tried inhalants. Nitrous oxide is among the most abused of these inhalants due to its low cost, easy availability and commercial appeal – one flavor of the gas is named “pink bubble gum.”

YouTube video
Pure nitrous, inhaled for a quick high, can be lethal.

Laughing gas parties

Because of legal loopholes in the Food and Drug Administration Act, nitrous oxide remains unregulated. What’s more, U.S. scientists have done relatively little research on its abuse, partly because the public still perceives the substance as benign, particularly when compared with alcohol.

The few studies on the use of nitrous oxide are limited mainly to case reports – that is, a report on a single patient. Although limited in scope, they’re alarming.

More thorough studies are available in the United Kingdom and Europe, where there’s even more demand for the product. One example: Over a 20-year period, 56 people died in England and Wales after recreational use. Typically, deaths occur from hypoxia, which is the lack of oxygen to the brain, or accidents occurring while intoxicated by the gas, such as car wrecks or falls.

Americans have known about the effects of nitrous oxide for centuries. Before becoming a medicinal aid, nitrous oxide was popular at “laughing gas” parties during the late 1700s.

Physicians began using it in the U.S. around the mid-19th century after Horace Wells, a dentist, attended a stage show – called “Laughing Gas Entertainment” – and saw the numbing effect that nitrous oxide had on audience volunteers. By coincidence, Wells was having a wisdom tooth removed the next day, so he tried the gas during his procedure. The nitrous oxide worked; Wells said he felt no pain. Thereafter, medicinal use of the gas was gradually accepted.

Today, nitrous oxide is often used in dentist offices. It’s safe under a doctor’s supervision as a mild sedative that serves as a pain reliever and numbing agent.
Nitrous oxide also benefits some patients with severe psychiatric disorders, including treatment-resistant depression and bipolar depression. It may also help with anxiety and pain management.

Bans and restrictions

No federal age restrictions exist for purchasing nitrous oxide products, although a few states have passed age limits.

As of May 2025, four U.S. states – Louisiana, Michigan, Alabama and California – have banned the recreational use of nitrous oxide, and more than 30 states are working on legislation to ban or at least restrict sale of the products. In addition, numerous lawsuits filed against the manufacturers are in court.

Research shows school prevention programs help keep kids from using these products. So does early screening of patients by primary care and mental health physicians. The sooner they can intervene, the more likely that ongoing therapy will work.

Through appropriate legislation, regulation, education and intervention, nitrous oxide abuse can be slowed or stopped. Otherwise, these products – with their sleek packaging and attractive social media campaigns that obscure their dangers – remain a growing threat to our children.The Conversation

Andrew Yockey, Assistant Professor of Public Health, University of Mississippi

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

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Note: The following A.I. based commentary is not part of the original article, reproduced above, but is offered in the hopes that it will promote greater media literacy and critical thinking, by making any potential bias more visible to the reader –Staff Editor.

Political Bias Rating: Centrist

The content presents a fact-based and balanced view on the recreational use of nitrous oxide, emphasizing public health concerns and the need for regulation. It relies heavily on scientific studies, expert opinions, and governmental data without advocating for extreme positions. The article calls for sensible legislation, education, and intervention to mitigate harm, reflecting pragmatic concern rather than ideological bias toward either left or right political perspectives.

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Basic research advances science, and can also have broader impacts on modern society

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theconversation.com – Bruce J. MacFadden, Distinguished Professor Emeritus, University of Florida – 2025-05-08 07:40:00



Basic research, while often not directly applicable to everyday life, plays a critical role in advancing science and technology, which can have broader societal impacts. The U.S. is a global leader in scientific innovation, with federal agencies like the National Science Foundation (NSF) funding a significant portion of basic research. This research not only deepens knowledge but also engages the public through broader impact activities. Such activities include museum exhibits, school programs, and citizen science projects, all of which help disseminate discoveries and engage non-scientists. Over the years, many basic research projects have led to groundbreaking technological advancements, proving the unpredictable value of curiosity-driven science.

As charismatic animals, sharks can stimulate interest in science, research and technology.
Florida Museum (Kristin Grace photo)

Bruce J. MacFadden, University of Florida

It might seem surprising, but federal research funding isn’t just for scientists. A component of many federal grants that support basic research requires that discoveries be shared with nonscientists. This component, referred to as “broader impacts” by the National Science Foundation, can make a big difference for K-12 students and teachers, museumgoers, citizen scientists and other people interested in science, while also helping the scientists themselves give back to the taxpayers that fund their work.

Basic research, often done because of a curious scientist’s interest, may not initially have a direct application, like developing the smartphone or curing a disease. But these discoveries build important knowledge in the natural sciences, engineering, mathematics and related disciplines.

The U.S. is a world leader in scientific and technological innovation. On the federal level, the National Science Foundation, or NSF, is one of the primary funders of this kind of basic research. In 2022, the federal government funded 40% of all basic research done in the U.S., with the remainder coming from other sources, including the business sector.

During World War II, President Franklin D. Roosevelt wanted to position the U.S. for strategic and economic leadership worldwide. He commissioned physicist Vannevar Bush to develop a vision for the future of U.S. science and technology. His 1945 report, “Science: the Endless Frontier,” became the blueprint for government-funded basic research. In 1950, Congress created the National Science Foundation to promote the progress of science, advance national prosperity and welfare and secure the national defense.

A black-and-white photograph of Vannevar Bush wearing a suit and tie.
Vannevar Bush historically said that ‘without scientific progress, no amount of achievement in other directions can insure our health, prosperity and security as a nation in the modern world.’
Office for Emergency Management Defense

During the early decades of NSF, the 1950s until the late 1990s, proposals were mostly evaluated based on the quality of the science and the scientists doing the work. But then, the foundation created a new system, still in place today.

Thus, each NSF research proposal is now peer-reviewed based on two criteria: intellectual merit, or the quality and novelty of the science and track record of the research team, and “broader impacts” – related activities that disseminate the discoveries to general audiences.

Intellectual merit is about advancing science knowledge and innovation, while broader impacts describe why people who aren’t scientists should care, and how society could benefit from this research.

Another pragmatic aspect to broader impacts is that taxpayers pay for these activities, so it’s important for them, and Congress, to understand their return on investment. These broader impacts activities communicate about, and engage the public in, research in a variety of ways.

While researchers usually understand the intellectual merit of their NSF-funded projects, these broader impacts can be challenging to characterize.

Broader impact activities

Since childhood, I’ve had an interest in paleontology — the study of fossils and what we can learn from them about prehistoric life. This field is primarily basic research — adding to knowledge about ancient life. As a scientist conducting basic research, I’ve felt the responsibility to give back to society through broader impacts activities, and I’ve seen many of the benefits that these activities can have.

My primary area of interest has been extinct mammals of the Americas, particularly the 55-million-year-old record of fossil horses on this continent. For years, NSF supported my discoveries about this interesting group of animals. Fossil horses are a classic example of evolution — in books and museum exhibits.

A horse skeleton constructed from fossilized bones, on display at a museum
A fossil horse from the Ice Age on display at the Florida Museum. Fossil horses are a classic example of evolution — both in books and museum exhibits.
Florida Museum (Mary Warrick photo)

Many people are generally interested in horses, so it’s easy to attract their attention with this charismatic group. They also are often surprised to learn that prehistoric horses were native to North America for millions of years. Then, during historical times, they were first introduced by humans onto the continent about 500 years ago.

Over the years, my research team has used grant-funded broader impact activities to teach people about these fossil horses and our research. One example included working with K-12 science teachers to develop lesson plans. The students measured fossil horse teeth and explored how their teeth adapted to feeding on grasses. We’ve also developed exhibits on fossil horses and studied how they communicate science to museum visitors.

Science teachers have joined our fieldwork to collect fossils along the Panama Canal during its recent expansion. I’ve given many talks and collaborated with fossil clubs and their members throughout the U.S. We’ve also promoted projects like Fossils4Teachers where fossil collectors donated their fossils and worked alongside K-12 teachers to develop lesson plans that were implemented back in the teachers’ classrooms.

A group of people standing and kneeling outdoors.
The Fossils4Teachers professional development workshop, hosted by the Florida Museum in 2017, is one example of a broader impacts activity.
Florida Museum (Jeff Gage photo)

We’ve also been able to activate peoples’ interest in other animal groups — such as fossil sharks. Through our Scientist in Every Florida School program, we gave middle school teachers study kits with real fossil shark teeth. Their students learned to identify the shark teeth and then trained computers to identify the teeth using machine learning, a type of artificial intelligence.

A student writing on a worksheet with a photo of a shark and a shark tooth. Next to her are two large fossil shark teeth.
Students study fossil shark teeth through a program at the Florida Museum of Natural History.
Florida Museum (Megan Higbee Hendrickson photo)

Broader impact outcomes

Broader impacts activities like these can have a variety of short- and long-term outcomes. More than 50 million people visit natural history museums in the U.S. annually. Activities that promote museums can reach large numbers of people in their pursuit of lifelong learning.

More broadly, participatory science interest groups can allow people to learn about science while informing basic research projects. Within the field of natural history, a few popular examples include the Merlin app and the iNaturalist app, both of which have millions of active observers. Merlin encourages people to submit their observations of birds, and iNaturalist accepts sightings of plants, animals and fossils, which researchers can carefully vet and use as data.

Many of the K-12 teachers my team has worked with report that they feel more confident teaching the new science content that they learned from our collaborations.

Interestingly, although much of the research on science professional development focuses on the teachers, scientists also report a high level of satisfaction and improved communication skills after working with these teachers, both in the field and back in the classroom.

Basic research benefits for society

Generations of U.S. scientists have greatly benefited from federal investments in basic research. In the 75 years since NSF’s founding, the organization has funded hundreds of thousand projects to advance science and technology.

These have supported basic research discoveries and also the training and career development of the tens of thousands of scientists working on these projects annually.

Many prominent scientists have gone on to be productive leaders and innovators in the U.S. and internationally. NSF has funded more than 268 Nobel laureates.

While NSF invests in the discovery of foundational knowledge about the natural world, funded projects have not traditionally had direct applications for societal benefits. To be sure, however, many of NSF’s projects – for example, on lasers and nanotechnology – started out as curiosity-driven basic research and ended up with immense applications for technological innovation and economic prosperity.

For example, mapping the Earth’s ocean floor’s magnetic properties during World War II helped scientists understand how the crust moves and mountains form. This led to the plate tectonic revolution in the earth sciences. This line of basic research then led to an important application: predicting the probable location of high-risk earthquake zones worldwide.

None of these downstream applications and benefits to society would have been realized without basic research discoveries supported by federal agencies such as NSF, and the further value added through broader impacts activities.The Conversation

Bruce J. MacFadden, Distinguished Professor Emeritus, University of Florida

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

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Note: The following A.I. based commentary is not part of the original article, reproduced above, but is offered in the hopes that it will promote greater media literacy and critical thinking, by making any potential bias more visible to the reader –Staff Editor.

Political Bias Rating: Centrist

This content presents a balanced and factual overview of federal research funding, specifically through the National Science Foundation. It emphasizes the importance of basic scientific research, its societal benefits, and the role of public engagement without promoting any partisan agenda. The piece acknowledges historical government involvement and highlights the broad impact of science on society in a neutral tone. Hence, it aligns with a centrist political bias, focusing on informative and non-controversial insights into science policy and funding.

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