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Source: The Conversation – USA – By Rui Bo, Associate Professor of Electrical and Computer Engineering, Missouri University of Science and Technology

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to CuriousKidsUS@theconversation.com.

What are those orange balls on some power lines? – Maggie, age 8, West Chester, Pennsylvania

Have you ever looked up while driving on a highway and spotted those big orange balls hanging on power lines? They look a bit like giant toy beads strung along the electric wires.

What in the world are those overgrown basketballs doing up there?

I’m a professor who teaches about and researches power systems, the big networks that move electricity from power plants to our homes, schools and businesses.

Those big orange balls don’t help with electricity flow or improve the efficiency of the power lines, but they do have a very important job. Officially called aviation marker balls or spherical markers, they’re there to help pilots see power lines so airplanes and helicopters don’t crash into them. They’re like bright warning signs in the sky, protecting pilots, passengers and people on the ground below.

Big round warning signs in the sky

Power lines can be very hard to see from an airplane or helicopter, especially when pilots are flying low. Thin metal wires can visually blend into the background of nature.

The orange balls help the lines stand out. You can think of them as being like reflective tape on a bike – just a little something simple that helps people notice a danger before it’s too late.

Orange isn’t a random choice. This vibrant color is very visible to the human eye and especially stands out against the more muted colors of nature – blue sky, green trees or gray clouds. Sometimes the balls are red or white, or even striped, but orange is the most common because it works well in most lighting conditions.

Aviation safety rules in many countries explain which colors should be used so pilots can quickly recognize hazards. Organizations like the U.S. Federal Aviation Administration publish guidelines you can check out about marking obstacles near flight paths.

These balls may look like slightly oversized ping-pong balls from your perspective on the ground. But most are actually much bigger, about the size of a large beach ball, roughly 2 to 3 feet (0.6 to 1 meter) across. Each one can weigh 10 to 25 pounds (4.5 to 11 kilograms), about as heavy as a large backpack full of books.

They’re usually made from strong plastic or fiberglass, similar to materials used in boats or playground equipment. That way, they can survive years of sun, rain, snow, wind – and even the occasional bird landing on them.

Even though they sit on wires that carry huge amounts of electricity, the balls themselves are not energized. They’re made of insulating materials, so electricity does not flow through them.

Why are there so many wires up there?

High-voltage power lines are like highways for electric power, carrying electricity from the power plants where it is generated to the places where it is used.

The wires are strung between sturdy metal towers or wooden poles that are very tall to keep dangerous high-voltage electric wires high up in the sky, far away from people on the ground. This design makes it safe to walk, play and drive underneath them. Some transmission towers, especially for very high-voltage lines, can be as tall as a 15-story building.

If you look closely at big transmission lines, you’ll often see three thick wires, sometimes with an additional thinner one on top that’s called a shield wire. Because the shield wire sits higher, lightning is more likely to hit it first, protecting the other wires from a strong blast of electricity that can damage equipment or cause power outages. The shield wire is connected to the ground, so a lightning strike’s electricity can flow safely down the tower and into the earth.

The three main wires work together to carry electricity in a steady rhythm. By sharing the job among three wires instead of one, the system can move more energy with less waste, making it more efficient.

Clamping the balls to the wires

Installing the aviation marker balls is a job for specially trained crews, often working from helicopters. The power line usually stays turned on while the work is being done, so safety rules and careful planning are critical. The ball comes in two halves that clamp around the wire and bolt together tightly.

Once installed, these balls can last 10 to 15 years, depending on weather and conditions. They don’t need much maintenance, but utilities inspect them from time to time to make sure they haven’t cracked or faded too much.

Not every transmission line needs the markers. Usually only places where aircraft are more likely to fly low – such as near rivers, valleys, airports or helicopter routes – will use these brightly colored balls. Most neighborhood power lines are too low to need markers.

Next time you spot those bright orange dots in the sky, you’ll know: They’re not electrical equipment, and their color isn’t random. They’re simple, clever tools helping keep our busy world a little safer.

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.

Rui Bo does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

– ref. What are those orange balls on some power lines? – https://theconversation.com/what-are-those-orange-balls-on-some-power-lines-272019

Source: The Conversation – USA – By Gregory M. Dickinson, Assistant Professor of Law, University of Nebraska-Lincoln; Institute for Humane Studies

You open a free app to do one simple thing. Before you even start, a full-screen message asks whether you want to try the paid version. The “Start free trial” button is large, bright and hard to miss. The option to keep using the free version is smaller, buried at the bottom. The same prompt appears again tomorrow. And the day after that.

A lot of people look at screens like that and think, “Surely this has to be illegal.” We even have a name for them, “dark patterns.” They feel pushy. They waste time. They seem designed to wear you down. But in most cases, they are perfectly lawful.

“Dark pattern” is not a legal term with a clear boundary. It is a broad label for digital designs that nudge, pressure, confuse or trap users. As a legal scholar who studies consumer protection and digital design, I think the most important thing for readers to understand is that the label “dark pattern” covers a broad spectrum.

Some of that spectrum is just annoying. Some of it is aggressive salesmanship. And some of it crosses the line into deception or coercion. Federal and state consumer protection laws are mostly aimed at that last category. They do not ban every design choice people dislike, only those that trick or coerce.

Annoying isn’t illegal

That reality may sound unsatisfying, but it is not unusual. Offline life is full of things that are irritating but not unlawful. Think of the cashier who asks whether you want to sign up for the store credit card, then points out the discount you are turning down, then asks again. Most people know exactly what is happening. They roll their eyes, say no and try to shop somewhere else next time.

The same is true online. A repeated pop-up can be obnoxious. A guilt-inducing button can be tacky. But consumers recognize ordinary annoyance for what it is. In many cases, the market answer is simple: Close the app, ignore the pitch or take your business elsewhere.

Similarly, law does not ban persuasive sales pitches just because they are effective. A car salesperson who keeps steering you toward the upgraded model is trying to influence your choice. So is the airline clerk who offers travel insurance. So is the restaurant server who asks whether you want dessert. Salesmanship is nothing new. Digital design often borrows from familiar techniques.

That helps explain why lawmakers cannot simply outlaw “manipulation.” And so many interfaces are built to persuade, openly and lawfully.

What crosses the line

What the federal FTC Act and analogous state consumer-deception statutes usually care about is not whether a design is annoying. They focus on whether the design is likely to mislead a reasonable consumer. That is the core idea in modern consumer protection law.

So a design is likelier to be unlawful when it hides key facts, makes an optional choice look mandatory or tricks people about the effect of the button they are pressing. A fake countdown timer, a disguised ad, a misleading one-click purchase button or a cancellation path that looks finished when it is not are all different from ordinary hard selling. Those designs do not just pressure users; they can deceive them.

That is also why the app maker’s intent is not always the key question. In many consumer protection cases, a company does not get a free pass just because no one said, “Let’s trick people.” The legal question is often about effect: What would a reasonable user likely understand from this screen?

Research on dark patterns reinforces that concern. Even relatively mild designs can push people into choices they would not otherwise make. And regulators have increasingly focused on subscription flows, hidden fees and cancellation obstacles for exactly that reason.

Why it feels like dark patterns are everywhere

One reason people might think there are no laws against dark patterns is that they see them so often. But that frequency reflects that the term covers a wide range of conduct, from lawful nagging to outright deception.

It also reflects enforcement limits. Regulators cannot chase every irritating screen on every app and website. They have to prioritize the worst cases. That leaves a lot of borderline conduct in the wild, which makes the whole problem feel bigger and murkier to ordinary users.

So when people ask why there is not a law against dark patterns, the best answer is that there already is, but the law does not prohibit every annoying or high-pressure design. It targets lies, misleading cues and coercive obstacles.

That line can be fuzzy. But the fuzziness is not a mistake. It is what you get when the law tries to separate persuasion from deception in a world full of both.

Gregory M. Dickinson does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

– ref. Dark patterns on the web are designed to manipulate you – why aren’t they all illegal? – https://theconversation.com/dark-patterns-on-the-web-are-designed-to-manipulate-you-why-arent-they-all-illegal-279961

Source: The Conversation – USA – By Ryan St Laurent, Assistant Professor of Biology, University of Colorado Boulder

To the untrained eye, the Florida scrub ecosystem isn’t much to look at. Scattered in patches around coastal and inland Florida, the scrub landscape is dominated by shrubs and short oaks, all growing out of sandy soil.

“Scrub” is truly an apt name for it.

But this habitat is home to a number of unique plant and animal species, including the threatened Florida scrub-jay, the only bird found only in Florida.

The list of specialized scrub animals grew longer this spring when I officially named – and found in the wild – a species of moth unique to the Florida scrub.

I’m an evolutionary biologist and entomologist, serving as curator of entomology at the University of Colorado Boulder Museum of Natural History. In March 2026 I, along with my collaborators, Scott Wehrly and Jeff Slotten, published an article in ZooKeys describing this new moth from the Florida scrub.

I colloquially refer to it as the “Florida sack-bearer,” but it’s formally known as Cicinnus albarenicolus, Latin for “white sand dweller.” The name “sack-bearer” indicates that it belongs to a small family of moths known as Mimallonidae whose caterpillars make sacklike cases that they haul around, kind of like the way a hermit crab carries around a shell. There are just over 300 sack-bearer species, with only six, including our new one, known from North America.

The discovery

The recent publication of our scientific paper was the first time the scientific community learned of the moth’s existence, but it is the culmination of more than a decade of work.

I have been studying sack-bearers throughout my professional career, which started as an undergraduate at Cornell University, where I worked in the Cornell University Insect Collection. It was in this collection that a small sample of sack-bearer moths collected in Florida, with a chunky body and pink-hued wings spanning about 1.25-1.5 inches (3-4 centimeters) – medium size for a moth – caught my eye.

I began to wonder whether perhaps this moth was a separate species of sack-bearer, because it looked quite different from the more beige-colored Melsheimer’s sack-bearer that is common all over the eastern United States, including Florida. But I did not yet have enough data to substantiate my theory.

Then as a graduate student at the University of Florida, I delved into learning more about sack-bearer evolution. Whenever I had a free moment, I spent time in the field looking for wild individuals of the still-unnamed Florida sack-bearer. But still, no luck.

Then I spent three years as a postdoctoral fellow at the Smithsonian National Museum of Natural History. Even though I was primarily working on a completely different group of moths, I had not forgotten about the Florida moth. And there, in the Smithsonian collections, I found a single specimen of a Florida sack-bearer from 1960.

Fortunately, it was a recent enough specimen to yield a good DNA sample. This allowed me to get the final piece of information that I was looking for: a DNA sequence to confirm that this moth was distinct from its relatives.

The genetic results were unequivocal: The Florida species was clearly distinct, thus confirming my long-held suspicions that this was a new, undescribed species of moth. This was the final piece of information I needed to start writing the paper formally describing and naming the new moth.

Encounter in the wild

As excited as I was to describe a new species, I feared that the moth might already be extinct, since no recent specimens existed and the Florida scrub habitat is highly degraded, down to about 10% of what ecologists estimate was present prior to European settlement.

But I contacted various moth collectors in Florida to see whether anyone had seen this moth recently, and to my surprise one of them had. The co-authors on the Zookeys paper, Jeff Slotten and Scott Wehrly, helped me discover a small set of specimens from the 2010s and 2020s that Scott had collected. This discovery, in late 2025, allowed me to add some new specimens to the paper and update the text reporting this newly discovered collection of more contemporary samples of Florida sack-bearers.

Knowing that all sightings of this moth occurred between March and May, I traveled to Florida in April. I was hoping to see it for myself and learn more about its active times, habitat requirements, diet, mating habits and other aspects of its biology – all still completely unknown. Since the recent specimens were all male, I set the goal to find a female, which would be the first one seen in over 60 years. Finding a female would also be an opportunity to collect eggs.

On April 18, 2026, I traveled to a new site that I had scoped out back in grad school, and sure enough, at 8:49 p.m., I found a female at my specialized moth light trap. This female was followed by two others, and I was able to collect eggs. Hopefully this summer these will yield a bunch of caterpillars so my colleagues and I can observe the moth’s full life cycle and learn more about this elusive insect.

What makes the Florida sack-bearer so special?

Without knowing more about it, it’s challenging to articulate what this moth’s larger role in the ecosystem might be. And that is precisely why this discovery is important.

One possibility that is already becoming clear is that this species may be an excellent indicator of Florida scrub health and how different forest management techniques affect the scrub ecosystem. My recent field work indicates that this particular moth may be thriving in areas experiencing more recent and frequent prescribed burns, but this hypothesis needs further study. My hope is that studying this moth will give a better sense of how to manage scrubs in order to protect this and other species with similar habitat requirements.

The evolution of the Florida sack-bearer also remains a puzzle. Just how did it get to Florida in the first place? White sand scrubs are thought to be older than yellow sand scrubs of Florida and are formed from ancient sand dunes. Perhaps the Florida sack-bearer is an ancient relic of a time when Florida was very different from today.

By studying this moth and its distribution in the state, we may better understand how sack-bearers arrived in North America from Central and South America millions of years ago.

What’s in a name?

In total, only 19 specimens of the Florida sack-bearer were known to me at the time of its formal description. Only three of those were collected after 1964, and those all came from locations near Ocala, Florida. The other 13 specimens are from just five white sand scrub habitats scattered across peninsular Florida. While the news that the moth persists in at least a couple of places is welcome, sites that supported this moth back in the 1960s may no longer have enough scrub habitat due to substantial habitat loss.

It’s possible that this moth has been discovered just in time to realize it’s at risk of going extinct. But my hope is that by naming this rare moth, our team has enabled conservationists and legislators to fight for its protection.

Nothing to disclose.

– ref. A newly rediscovered moth species in Florida may already be at risk – https://theconversation.com/a-newly-rediscovered-moth-species-in-florida-may-already-be-at-risk-281717