The EPA, which regulates pesticides in the U.S., defines a pesticide as any substance or mixture of substances intended to prevent, destroy, repel or mitigate any pest, such as weeds, insects and organisms, that attack plants. Pesticides are often referred to as toxins when found in food, water bodies or other places where they are not intended. But just because something is detected doesn’t mean it’s harmful to humans or wildlife. Toxicity depends on how much of the substance a person or animal is exposed to, how they are exposed to it – such as breathing it, or getting it on their skin – and for how long. The Department of Agriculture began regulating pesticides in 1947 with the Federal Insecticide, Fungicide, and Rodenticide Act. Most of the department’s interest was whether a particular pesticide was effective against the target pests. In 1970, the newly formed EPA took over responsibility for pesticides. It shifted its focus to the safety of consumers, farmworkers and the environment after the Federal Environmental Pesticide Control Act took effect in 1972.A wide range of pesticides are available to consumers for use in their homes and yards.Jeffrey Greenberg/Universal Images Group via Getty Images
Risk-benefit analysis
Federal law requires the EPA to evaluate both the risks and the benefits of each pesticide – and to revisit that analysis at least every 15 years for every pesticide used in the U.S. The EPA determines whether the risks to people, animals or the environment are too high for the benefits the pesticide provides and whether any of those risks can be reduced. Sometimes a chemical’s risk can be lessened by recommending mitigation strategies such as wearing protective clothing, reducing environmental spread by barring the use of pesticides near the edges of a property, or decreasing the amount of a pesticide that’s legal to use. In its analysis of any given pesticide, the EPA requires a massive amount of data from the manufacturer about what ingredients the pesticide contains and how they work. The agency also reviews scientific research on the pesticide and uses its own scientists and independent experts to evaluate any studies that were submitted by the manufacturer. The EPA uses all the available data on a pesticide to evaluate the dose that would be toxic to a range of organisms, as well as what residues the pesticide may leave on plants, in the soil and in water. The data is incorporated into computer models that estimate the potential amount of the chemical that may come in contact with humans, animals and the environment. Those models’ results are then combined with toxicity data to determine risk. The models used by EPA scientists are very conservative. They often use significant overestimates of exposure, which means that when the models determine the risk of a pesticide is below a particular level, they are evaluating the risk posed by far higher quantities of the chemical than will ever actually be used. The risk from the amount actually used, therefore, is even less likely to cause harm. The EPA also provides opportunities for public comment on a pesticide and uses that information in its evaluations as well.Pesticides are commonly used in commercial agriculture.Charlie Neibergall/AP
Additional scrutiny
The Endangered Species Act also requires the EPA to evaluate the effects of pesticides on threatened and endangered species. If a pesticide is found to potentially be dangerous to a protected species or its habitat, the EPA will discuss those findings with the U.S. Fish and Wildlife Service and the National Marine Fisheries Service, which enforce the Endangered Species Act, and determine what to do to ensure the species aren’t harmed. The law’s requirement to reevaluate each pesticide every 15 years is based on the fact that science evolves and information becomes more precise. New data can shed light on potential risks and benefits, and even lead to pesticides being banned or more closely restricted. Until recently, for instance, pesticide residues on plants, food and in the environment were measured in parts per million. Newer equipment can measure even smaller amounts, determining parts per billion, which is as precise as identifying one single second in 32 years. Some chemicals can even be measured in parts per trillion, equivalent to one drop of water in 20 Olympic-size swimming pools. That means exposures can be more accurately measured. While some chemicals can be toxic in very small concentrations, most pesticides can be detected at levels that do not pose a biological risk.
Allowing a pesticide to be used
If the EPA determines that a pesticide’s risks outweigh its benefits, then its staff will conduct additional analyses to determine how to mitigate the risks enough to justify using it. If that’s not possible, the EPA will reject the application and not allow the pesticide to be used in the U.S. If the agency determines that the benefits outweigh the risks, the EPA approves the pesticide for sale and use in the U.S. The law requires the pesticide come with a label providing a strict set of guidelines for how, when and where to use the pesticide. The guidelines define amounts and timing for applying the pesticide safely, and specific restrictions or protection strategies to control the target pests while eliminating or minimizing harm to the environment, workers and the public. The EPA also makes information on pesticides available to the public, so anyone can find out how to use them safely. Using the pesticide without following those directions is a violation of federal law.Jeffrey Gore, Professor of Agricultural Science and Plant Protection, Mississippi State University This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Most of us still call them UFOs – unidentified flying objects. NASA recently adopted the term “unidentified anomalous phenomena,” or UAP. Either way, every few years popular claims resurface that these things are not of our world, or that the U.S. government has some stored away.
I’m a sociologist who focuses on the interplay between individuals and groups, especially concerning shared beliefs and misconceptions. As for why UFOs and their alleged occupants enthrall the public, I’ve found that normal human perceptual and social processes explain UFO buzz as much as anything up in the sky.
Historical context
Like political scandals and high-waisted jeans, UFOs trend in and out of collective awareness but never fully disappear. Thirty years of polling find that 25%-50% of surveyed Americans believe at least some UFOs are alien spacecraft. Today in the U.S., over 100 million adults think our galactic neighbors pay us visits.
It wasn’t always so. Linking objects in the sky with visiting extraterrestrials has risen in popularity only in the past 75 years. Some of this is probably market-driven. Early UFO stories boosted newspaper and magazine sales, and today they are reliable clickbait online.
In 1980, a popular book called “The Roswell Incident” by Charles Berlitz and William L. Moore described an alleged flying saucer crash and government cover-up 33 years prior near Roswell, New Mexico. The only evidence ever to emerge from this story was a small string of downed weather balloons. Nevertheless, the book coincided with a resurgence of interest in UFOs. From there, a steady stream of UFO-themed TV shows, films, and pseudo-documentaries has fueled public interest. Perhaps inevitably, conspiracy theories about government cover-ups have risen in parallel.
Some UFO cases inevitably remain unresolved. But despite the growing interest, multiple investigations have found no evidence that UFOs are of extraterrestrial origin – other than the occasional meteor or misidentification of Venus.
But the U.S. Navy’s 2017 Gimbal video continues to appear in the media. It shows strange objects filmed by fighter jets, often interpreted as evidence of alien spacecraft. And in June 2023, an otherwise credible Air Force veteran and former intelligence officer made the stunning claim that the U.S. government is storing numerous downed alien spacecraft and their dead occupants. https://www.youtube.com/embed/2TumprpOwHY?wmode=transparent&start=0 UFO videos released by the U.S. Navy, often taken as evidence of alien spaceships.
Human factors contributing to UFO beliefs
Only a small percentage of UFO believers are eyewitnesses. The rest base their opinions on eerie images and videos strewn across both social media and traditional mass media. There are astronomical and biological reasons to be skeptical of UFO claims. But less often discussed are the psychological and social factors that bring them to the popular forefront.
Many people would love to know whether or not we’re alone in the universe. But so far, the evidence on UFO origins is ambiguous at best. Being averse to ambiguity, people want answers. However, being highly motivated to find those answers can bias judgments. People are more likely to accept weak evidence or fall prey to optical illusions if they support preexisting beliefs.
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For example, in the 2017 Navy video, the UFO appears as a cylindrical aircraft moving rapidly over the background, rotating and darting in a manner unlike any terrestrial machine. Science writer Mick West’s analysis challenged this interpretation using data displayed on the tracking screen and some basic geometry. He explained how the movements attributed to the blurry UFO are an illusion. They stem from the plane’s trajectory relative to the object, the quick adjustments of the belly-mounted camera, and misperceptions based on our tendency to assume cameras and backgrounds are stationary.
West found the UFO’s flight characteristics were more like a bird’s or a weather balloon’s than an acrobatic interstellar spacecraft. But the illusion is compelling, especially with the Navy’s still deeming the object unidentified.
Anyone, including pilots and intelligence officers, can be socially influenced to see things that aren’t there. Research shows that hearing from others who claim to have seen something extraordinary is enough to induce similar judgments. The effect is heightened when the influencers are numerous or higher in status. Even recognized experts aren’t immune from misjudging unfamiliar images obtained under unusual conditions.
Group factors contributing to UFO beliefs
“Pics or it didn’t happen” is a popular expression on social media. True to form, users are posting countless shaky images and videos of UFOs. Usually they’re nondescript lights in the sky captured on cellphone cameras. But they can go viral on social media and reach millions of users. With no higher authority or organization propelling the content, social scientists call this a bottom-up social diffusion process.
In contrast, top-down diffusion occurs when information emanates from centralized agents or organizations. In the case of UFOs, sources have included social institutions like the military, individuals with large public platforms like U.S. senators, and major media outlets like CBS.The left image shows bottom-up diffusion, in which information spreads from person to person. The right shows top-down, in which information spreads from one authority. Barry Markovsky
Amateur organizations also promote active personal involvement for many thousands of members, the Mutual UFO Network being among the oldest and largest. But as Sharon A. Hill points out in her book “Scientifical Americans,” these groups apply questionable standards, spread misinformation and garner little respect within mainstream scientific communities.
Top-down and bottom-up diffusion processes can combine into self-reinforcing loops. Mass media spreads UFO content and piques worldwide interest in UFOs. More people aim their cameras at the skies, creating more opportunities to capture and share odd-looking content. Poorly documented UFO pics and videos spread on social media, leading media outlets to grab and republish the most intriguing. Whistleblowers emerge periodically, fanning the flames with claims of secret evidence.
The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/
Why can’t it always be summer? It’s all about the Earth’s tilt
Earth’s axial tilt causes the seasons. As Earth orbits the Sun, different hemispheres tilt toward or away, creating summer and winter depending on location.
Why can’t it always be summer? – Amanda, age 5, Chile
With its long days just itching to be spent by water doing nothing, summer really can be an enchanting season. As Jenny Han wrote in the young adult novel “The Summer I Turned Pretty”: “Everything good, everything magical happens between the months of June and August.”
But all good things must come to an end, and summer cannot last forever. There’s both a simple reason and a more complicated one. The simple reason is that it can’t always be summer because the Earth is tilted. The more complicated answer requires some geometry.
I’m a professor of geography and the environment who has studied seasonal changes on the landscape. Here’s what seasons have to do with our planet’s position as it moves through the solar system.
This animation shows why the Earth has seasons.
Closeness to the Sun doesn’t explain seasons
First, you need to know that the Earth is a sphere – technically, an oblatespheroid. That means Earth has a round shape a little wider than it is tall.
Every year, Earth travels in its orbit to make one revolution around the Sun. The Earth’s orbit is an ellipse, which is more like an oval than a circle. So there are times when Earth is closer to the Sun and times when it’s farther away.
A lot of people assume this distance is why we have seasons. But these people would be wrong. In the United States, the Earth is 3 million miles closer to the Sun during winter than in the summer.Our distance from the Sun is not why we have seasons. NASA
Spinning like a top
Now picture an imaginary line across Earth, right in the middle, at 0° latitude. This line is called the equator. If you drew it on a globe, the equator would pass through countries including Brazil, Kenya, Indonesia and Ecuador.
Everything north of the equator, including the United States, is considered the Northern Hemisphere, and everything south of the equator is the Southern Hemisphere.
Now think of the Earth’s axis as another imaginary line that runs vertically through the middle of the Earth, going from the North Pole to the South Pole.
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As it orbits, or revolves, around the Sun, the Earth also rotates. That means it spins on its axis, like a top. The Earth takes one full year to revolve around the Sun and takes 24 hours, or one day, to do one full rotation on its axis.
This axis is why we have day and night; during the day, we’re facing the Sun, and at night, we’re facing away.
But the Earth’s axis does not go directly up and down. Instead, its axis is always tilted at 23.5 degrees in the exact same direction, toward the North Star.
The Earth’s axis is tilted due to a giant object – perhaps an ancient planet – smashing into it billions of years ago. And it’s this tilt that causes seasons.Because of the tilt of the Earth, we are able to experience the seasons. Stephanie Spera
It’s all about the tilt
So that means in June, the Northern Hemisphere is tilted toward the Sun. That tilt means more sunlight, more solar energy, longer days – all the things that make summer, well, summer.
At the same time, the Southern Hemisphere is tilted away from the Sun. So countries such as Australia, Chile and Argentina are experiencing winter then.
To say it another way: As the Earth moves around the Sun throughout the year, the parts of the Earth getting the most sunlight are always changing.
Fast-forward to December, and Earth is on the exact opposite side of its orbit as where it was in June. It’s the Southern Hemisphere’s turn to be tilted toward the Sun, which means its summer happens in December, January and February.
If Earth were not tilted at all, there would be no seasons. If it were tilted more than it is, there would be even more extreme seasons and drastic swings in temperature. Summers would be hotter and winters would be colder.The Earth’s axis is always tilted at 23.5 degrees. Stephanie Spera
Defining summer
Talk to a meteorologist, climate scientist or author Jenny Han, and they’ll tell you that for those of us in the Northern Hemisphere, summer is June, July and August, the warmest months of the year.
But there’s another way to define summer. Talk to astronomers, and they’ll tell you the first day of summer is the summer solstice – the day of the year with the longest amount of daylight and shortest amount of darkness.
The summer solstice occurs every year sometime between June 20 and June 22. And every day after, until the winter solstice in December, the Northern Hemisphere receives a little less daylight.
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Summer officially ends on the autumnal equinox, the fall day when everywhere on Earth has an equal amount of daylight and night. The autumnal equinox happens every year on either September 22 or 23.
But whether you view summer like Jenny Han or like an astronomer, one thing is certain: Either way, summer must come to an end. But the season and the magic it brings with it will be back before you know it.
Hello, curious kids! Do you have a question you’d like an expert to answer? Ask an adult to send your question to CuriousKidsUS@theconversation.com. Please tell us your name, age and the city where you live.
And since curiosity has no age limit – adults, let us know what you’re wondering, too. We won’t be able to answer every question, but we will do our best.
The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/
Dive into “The Knowledge,” where curiosity meets clarity. This playlist, in collaboration with STMDailyNews.com, is designed for viewers who value historical accuracy and insightful learning. Our short videos, ranging from 30 seconds to a minute and a half, make complex subjects easy to grasp in no time. Covering everything from historical events to contemporary processes and entertainment, “The Knowledge” bridges the past with the present. In a world where information is abundant yet often misused, our series aims to guide you through the noise, preserving vital knowledge and truths that shape our lives today. Perfect for curious minds eager to discover the ‘why’ and ‘how’ of everything around us. Subscribe and join in as we explore the facts that matter. https://stmdailynews.com/the-knowledge/
Arizona scholarships 2026: Arizona scholarships are open through ACF: one application for 160+ awards, plus ARAC’s $1,500 Ashby-Herring scholarships due April 6, 2026.
Scholarship season moves fast, and for a lot of Arizona families, the hardest part isn’t writing the essay or gathering transcripts—it’s simply finding the right opportunities in time.
The Archer Ragsdale Arizona Chapter (ARAC), Tuskegee Airmen, Inc. is encouraging students and the community to take advantage of scholarship resources through the Arizona Community Foundation (ACF), including an easy online application that can match applicants with 160+ scholarships—plus virtual workshops where students can get help directly from ACF’s scholarship team.
Whether you’re a high school senior, a current college student, or an adult re-entry student, ACF’s scholarship portal is designed to meet people where they are.
The Big Picture: One Application, 160+ Scholarships
According to the flyer, ACF awarded $6.3 million in scholarships last year, with over 160 scholarships available through a single, easy application.
What to watch for: Even if a student is only targeting one scholarship, completing the ACF application can surface additional matches they didn’t know existed.
ARAC (Tuskegee Airmen, Inc.) awards two or more scholarships to deserving Arizona students who are college-bound. The flyer highlights the Ashby-Herring scholarships, named in honor of late founding ARAC members who were original Tuskegee Airmen.
Free Virtual Workshops (Zoom): Get Help With Your Application
If you’ve ever watched a student stall out halfway through an application, these workshops are a smart fix: they’re designed so applicants can work on their scholarship application with support from ACF’s scholarship team.
Workshop dates (Zoom):
February 12, 2026 — 4:00 to 5:00 p.m.
March 5, 2026 — 4:00 to 5:00 p.m.
March 26 — 4:00 to 5:00 p.m. (date listed on flyer; confirm year when registering)
What to watch for: Register for the dates you can attend and come prepared with what you already have (basic info, activities list, questions). One hour of guided progress can save days of procrastination.
Why This Matters (and Why Sharing Helps)
The Tuskegee Airmen legacy is rooted in excellence, discipline, and breaking barriers—and scholarships tied to that legacy are meant to elevate futures for the next generation.
If you’re a parent, teacher, coach, mentor, or neighbor, consider this your nudge: forward the link, post it in a group chat, or share it with a student who might qualify. Deadlines hit quickly, and the easiest scholarship to win is often the one you actually apply for.
College isn’t just classes and credits — it’s learning how to manage your time, money, health, and relationships while you build a future that actually fits. In our College Life coverage, STM Daily News shares practical, real-world guides for students and families: campus living tips, study and productivity habits, career prep, budgeting basics, mental wellness check-ins, and smart ways to make the most of college in Arizona and beyond.
Expect quick reads, useful takeaways, and “what to do next” advice — whether you’re a first-year student, a transfer, or heading back to school.
Jeffrey Gore, Professor of Agricultural Science and Plant Protection, Mississippi State University This article is republished from The Conversation under a Creative Commons license. Read the original article.
