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Even before they can read, young children are visualizing letters and other objects with the same strategies adults use

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young children are visualizing letters and other objects
A student looks at different images, as eye-tracking technology monitors how she is visualizing the objects. Chris Necuze/FIU, CC BY

Even before they can read, young children are visualizing letters and other objects with the same strategies adults use

Shannon Pruden, Florida International University and Karinna Rodriguez, Florida International University What do puzzles, gymnastics, writing and using maps all have in common? They all rely on people’s ability to visualize objects as they spin, flip or turn in space, without physically moving them. This is a spatial skill that developmental psychologists call mental rotation. Whether a person is navigating a new city or doing a cartwheel, they must use mental rotation skills to move shapes or objects in their mind and make sense of where their bodies are going and what surrounds them. When children play with puzzles, building blocks or pattern games, they are also practicing mental rotation. Over time, these skills support learning in math, science and reading. This can look like visualizing pulley systems in physics or seeing the differences between similar-looking letters such as b and d, which young children often confuse. Strong mental rotation skills also lay the foundation for doing well in school and developing interest in careers in science, technology, engineering and math. Most preschool-age children are not yet learning to read – but it turns out they are still using some of these same spatial reasoning skills as they think about the world around them. We are scholars of, developmental science and were curious to find out how children as young as 3 years old mentally rotate objects. While there is research on the age at which children can mentally rotate objects, less is understood about how children are solving mental rotation problems. We found in our research, conducted from 2022 to 2023, that young children are using the same problem-solving strategies as adults when they solve a mental rotation task.

Children think visually, just like adults

We used eye-tracking technology to understand how a sample of 148 children, all between 3 and 7 years old, solved different mental rotation problems. Eye-trackers use harmless infrared light to capture eye movements. This technology lets us observe how children solve these problems in real time. As part of our study, we showed each child a large picture of items such as a fire truck, as well as two smaller pictures of the same truck, one placed above the other and positioned slightly differently. Children were asked to say which small picture on the right matched the large one on the left. In this example, the correct answer is the top picture, because that top fire truck can be rotated to match the large fire truck. The bottom fire truck was a mirrored image, and no matter how much you rotate it, it will never match the large fire truck.
file 20250925 64 xywaer.png?ixlib=rb 4.1
Children looked at pictures of fire trucks as part of a research study to assess how they manipulated the object in their heads. Karinna Rodriguez
While the children thought about their response, the eye-tracker, mounted right below the computer screen, recorded their eye movements. By looking at where and for how long children looked at each image, we figured out what kind of strategy they were using. Some children focused on fewer parts of the object and spent less time studying its details. This suggests they used a holistic strategy, meaning they took in the whole image at once, instead of breaking it into pieces. These children mentally rotated the entire object to solve the task. Other children focused on parts of the object and spent more time studying its details. This suggests they broke the image down into pieces instead of visualizing the image as a whole, known as a piecemeal strategy. Our findings support prior work showing that children generally use these two visual approaches to solve mental rotation problems. This study helped us learn where children look while solving puzzles and identify how they solve these problems – without ever having to ask the child, who might be too young to explain, about their process. Children were more likely to turn the whole image instead of breaking it down into pieces, a pattern of problem solving adults typically also use. This means that even very young children are already thinking about how objects move and turn in space in ways that are more advanced than expected.
White blocks are seen in different configurations in a drawing.
An example of a mental rotation task that can show how people are visually moving objects in their minds. Angie Mackewn, CC BY

Supporting children’s visual skills

Knowing how young children mentally rotate objects may help researchers, teachers and parents understand why some children struggle with learning to read. Children who break an image down into pieces, instead of visualizing it as a whole, to solve mental rotation problems may be the very same children who struggle with discriminating similar-looking letters such as p and q and may later be diagnosed with dyslexia. Parents can play an important role in building their child’s mental rotation skills. Parents can help children by offering them opportunities to practice rotating real objects with toys such as three-dimensional puzzles or building blocks. Tangrams – flat, colorful puzzles that come in different shapes – can be used to practice breaking down shapes of animals into pieces. Parents can encourage their child to look for shapes that match parts of the animal or object they are building. Nov. 8 is International STEM Day, a celebration of all things science, technology, engineering and mathematics. Research like ours provides valuable guidance for designing early STEM activities and educational tools. By directly observing children’s problem solving in real time, we can develop better ways for educators and toy makers to support strong spatial thinking from an early age. To celebrate, we encourage people to engage in activities that test their spatial skills, such as ditching the GPS for the day or playing a game of Tetris. Mental rotation is a powerful skill that helps us understand and interact with the surrounding physical world. From solving puzzles to reading maps, mental rotation plays a role in many everyday activities. Building mental rotation abilities can improve children’s performance in subjects such as reading, math and science and may inspire future careers in STEM fields. Shannon Pruden, Professor of psychology, Florida International University and Karinna Rodriguez, PhD candidate in psychology, Florida International University This article is republished from The Conversation under a Creative Commons license. Read the original article.

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/

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Science

Why can’t I wiggle my toes one at a time, like my fingers?

why can’t I wiggle my toes? Ever wondered why you can’t wiggle your toes one at a time like your fingers? Learn how evolution, muscles, and your brain all play a part in making fingers more independent than toes—and why that’s key for walking and balance.

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Why can’t I wiggle my toes one at a time, like my fingers?
A baby chimp can grab a stick equally well with its fingers and its toes. Anup Shah/Stone via Getty Images

Why Can’t You Wiggle Your Toes Like Your Fingers? The Science Behind Toe and Finger Movement

Steven Lautzenheiser, University of Tennessee 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.
Why can’t I wiggle my toes individually, like I can with my fingers? – Vincent, age 15, Arlington, Virginia

One of my favorite activities is going to the zoo where I live in Knoxville when it first opens and the animals are most active. On one recent weekend, I headed to the chimpanzees first. Their breakfast was still scattered around their enclosure for them to find. Ripley, one of the male chimpanzees, quickly gathered up some fruits and vegetables, sometimes using his feet almost like hands. After he ate, he used his feet to grab the fire hoses hanging around the enclosure and even held pieces of straw and other toys in his toes. I found myself feeling a bit envious. Why can’t people use our feet like this, quickly and easily grasping things with our toes just as easily as we do with our fingers? I’m a biological anthropologist who studies the biomechanics of the modern human foot and ankle, using mechanical principles of movement to understand how forces affect the shape of our bodies and how humans have changed over time. Your muscles, brain and how human feet evolved all play a part in why you can’t wiggle individual toes one by one.
young chimp running on all fours
Chimpanzee hands and feet do similar jobs. Manoj Shah/Stone via Getty Images

Comparing humans to a close relative

Humans are primates, which means we belong to the same group of animals that includes apes like Riley the chimp. In fact, chimpanzees are our closest genetic relatives, sharing almost 98.8% of our DNA. Evolution is part of the answer to why chimpanzees have such dexterous toes while ours seem much more clumsy. Our very ancient ancestors probably moved around the way chimpanzees do, using both their arms and legs. But over time our lineage started walking on two legs. Human feet needed to change to help us stay balanced and to support our bodies as we walk upright. It became less important for our toes to move individually than to keep us from toppling over as we moved through the world in this new way.
bare feet walking across sandy surface toward camera
Feet adapted so we could walk and balance on just two legs. Karina Mansfield/Moment via Getty Images
Human hands became more important for things such as using tools, one of the hallmark skills of human beings. Over time, our fingers became better at moving on their own. People use their hands to do lots of things, such as drawing, texting or playing a musical instrument. Even typing this article is possible only because my fingers can make small, careful and controlled movements. People’s feet and hands evolved for different purposes.

Muscles that move your fingers or toes

Evolution brought these differences about by physically adapting our muscles, bones and tendons to better support walking and balance. Hands and feet have similar anatomy; both have five fingers or toes that are moved by muscles and tendons. The human foot contains 29 muscles that all work to help you walk and stay balanced when you stand. In comparison, a hand has 34 muscles. Most of the muscles of your foot let you point your toes down, like when you stand on tiptoes, or lift them up, like when you walk on your heels. These muscles also help feet roll slightly inward or outward, which lets you keep your balance on uneven ground. All these movements work together to help you walk and run safely. The big toe on each foot is special because it helps push your body forward when you walk and has extra muscles just for its movement. The other four toes don’t have their own separate muscles. A few main muscles in the bottom of your foot and in your calf move all four toes at once. Because they share muscles, those toes can wiggle, but not very independently like your fingers can. The calf muscles also have long tendons that reach into the foot; they’re better at keeping you steady and helping you walk than at making tiny, precise movements.
a pen and ink drawing of the interior anatomy of a human hand
Your hand is capable of delicate movements thanks to the muscles and ligaments that control its bones. Henry Gray, ‘Anatomy of the Human Body’/Wikimedia Commons, CC BY
In contrast, six main muscle groups help move each finger. The fingers share these muscles, which sit mostly in the forearm and connect to the fingers by tendons. The thumb and pinky have extra muscles that let you grip and hold objects more easily. All of these muscles are specialized to allow careful, controlled movements, such as writing. So, yes, I have more muscles dedicated to moving my fingers, but that is not the only reason I can’t wiggle my toes one by one.

Divvying up brain power

You also need to look inside your brain to understand why toes and fingers work differently. Part of your brain called the motor cortex tells your body how to move. It’s made of cells called neurons that act like tiny messengers, sending signals to the rest of your body. Your motor cortex devotes many more neurons to controlling your fingers than your toes, so it can send much more detailed instructions to your fingers. Because of the way your motor cortex is organized, it takes more “brain power,” meaning more signals and more activity, to move your fingers than your toes.
illustration of a brain looking down at the top of the head with one section highlighted orange
The motor cortex of your brain sends orders to move parts of your body. Kateryna Kon/Science Photo Library via Getty Images
Even though you can’t grab things with your feet like Ripley the chimp can, you can understand why.
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. Steven Lautzenheiser, Assistant Professor of Biological Anthropology, University of Tennessee This article is republished from The Conversation under a Creative Commons license. Read the original article.
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The Empty Promise: Lynwood’s Lost Downtown Dream

In the 1970s, Lynwood, CA, dreamed of a downtown mall anchored by Montgomery Ward. Decades later, the empty lots told a story of ambition, delay, and renewal.

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In the 1970s, Lynwood, CA, dreamed of a downtown mall anchored by Montgomery Ward. Decades later, the empty lots told a story of ambition, delay, and renewal.

Artistic Image: R Washington and AI

In the early 1970s, Lynwood, California, dreamed big.

City leaders envisioned a new, modern downtown — a sprawling shopping and auto mall that would bring jobs, shoppers, and a sense of pride back to this small but growing city in the southeast corner of Los Angeles County. At the heart of the plan stood a gleaming new Montgomery Ward department store, which opened around 1973 and promised to anchor a larger commercial center that never fully came.

But for those of us who grew up in Lynwood during that time, the promise never quite materialized.

Instead, we remember acres of empty lots, chain-link fences, and faded “Coming Soon” signs that sat for decades — silent witnesses to a dream deferred.

The Vision That Stalled

In 1973, Lynwood’s Redevelopment Agency launched what it called Project Area A — an ambitious plan to clear and rebuild much of the city’s downtown core. Small businesses and homes were bought out, land was assembled, and the city floated bonds to support new construction.

For a brief moment, it looked as if the plan might work. Montgomery Ward opened its doors, serving as a retail beacon for the area. Yet the rest of the mall — the shops, restaurants, and auto dealerships — never came.

By the mid-1970s, much of downtown had been bulldozed, but little replaced it. And by the time Ward closed its Lynwood location in 1986, the vast lots surrounding it had become symbols of frustration and unfulfilled potential.

What Happened?

Some longtime residents whispered about corruption or backroom deals — the kind of speculation that grows when visible progress stalls.

But newspaper archives and redevelopment records tell a more complex story.

Lynwood’s plans collided with a series of hard realities:

The construction of the Century Freeway (I-105) disrupted neighborhoods and depressed land values. Environmental cleanup and ownership disputes slowed development. Economic shifts in retail — as malls in nearby Downey, South Gate, and Paramount attracted anchor stores — drained the local market. And later, political infighting among city officials made sustained redevelopment almost impossible.

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To this day, there’s no public record of proven corruption directly tied to the 1970s mall plan. What did exist was a tangle of bureaucracy, economic change, and missed opportunity — a perfect storm that left Lynwood’s heart half-built and half-forgotten.

Growing Up Among the Vacant Lots

For those of us who were kids in Lynwood during that era, the story is more personal.

We remember the sight of the Montgomery Ward building — modern and hopeful at first, then shuttered and fading by the mid-1980s.

We remember riding bikes past the empty dirt fields that were supposed to become shopping plazas. And we remember the quiet frustration of adults who had believed the city’s promises.

Those empty blocks became our playgrounds — but they also became symbols of the gap between what Lynwood was and what it wanted to be.

A New Chapter: Plaza México and Beyond

By the late 1990s and early 2000s, the dream finally resurfaced in a new form.

Developers transformed the long-idle site into Plaza México, a vibrant commercial and cultural hub that celebrates Mexican and Latin American heritage.

It took nearly 30 years for Lynwood’s downtown to come alive again.

The result is beautiful — but it’s also bittersweet for those who remember how long the land sat empty, and how many local businesses and residents were displaced in pursuit of a dream that took a generation to fulfill.

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Looking Back

The story of Lynwood’s lost mall isn’t just about urban planning.

It’s about hope, change, and resilience. It’s about how a community tried to reinvent itself — and how the children who grew up watching that effort still carry its memory.

Sometimes, when I drive through that stretch of Imperial Highway and Long Beach Boulevard, I still imagine what might have been: the bustling mall that never was, and the voices of a neighborhood caught between ambition and uncertainty.

📚 Further Reading

  • Montgomery Ward will close its Lynwood store. (Jan 3 1986) — Los Angeles Times. 

    Read it here

  • Montgomery Ward Won’t Confirm Deal: Lynwood Council Says Retailer to Stay Open. (Jan 16 1986) — Los Angeles Times. 

    Read it here

  • “Las Plazas of South LA” — academic paper by J.N. Leal (2012), discussing retail and redevelopment challenges in the region including Lynwood. 

    Read the PDF

  • Proposed Lynwood Development Draws Support and Criticism. (2007) — Los Angeles Sentinel. 

    Read it here

  • Wikipedia page: Lynwood, California — overview of the city including mention of Plaza México redevelopment. 

    Read it here

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/

 

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The Knowledge

Population Density: How Los Angeles Compares to New York and Chicago

How dense are America’s biggest cities? A clear breakdown of population density in Los Angeles, New York City, and Chicago—city limits vs metro areas—and why it matters.

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Population Density: How Los Angeles Compares to New York and Chicago

When people think of crowded American cities, New York City usually comes to mind first. Los Angeles, by contrast, is often labeled as “sprawling,” while Chicago is seen as a middle ground. But population density tells a more nuanced story—especially when comparing city proper numbers versus metro-area density.

City Proper: How Dense Are the Cities Themselves?

Looking only at official city boundaries, the differences are stark:

  • New York City averages about 27,000–28,000 people per square mile, making it by far the most densely populated major city in the United States.

  • Chicago comes in at roughly 12,000 people per square mile, dense but far more spread out than New York.

  • Los Angeles, despite being the nation’s second-largest city by population, averages just 8,400–8,500 people per square mile.

This gap reflects development patterns. New York grew upward with dense apartment buildings and extensive transit. Los Angeles expanded outward with single-family neighborhoods and car-oriented planning.

Metro Areas Tell a Different Story

When the lens widens to include surrounding suburbs and commuter communities, the rankings shift:

  • Los Angeles Metro Area: ~7,000 people per square mile

  • New York Metro Area: ~5,300 people per square mile

  • Chicago Metro Area: ~3,500 people per square mile

This surprises many readers. While New York’s core is extremely dense, its metro region stretches across a vast, lower-density area spanning parts of New York, New Jersey, and Pennsylvania. Los Angeles, on the other hand, has a metro region that is more consistently built-up, with fewer truly rural gaps.

Why Density Feels Different in Each City

Population density doesn’t always match perception:

  • New York feels crowded because density is concentrated vertically and transit funnels millions into compact areas.

  • Los Angeles feels congested not because of extreme density, but because people are spread out and heavily reliant on cars.

  • Chicago balances both, with dense neighborhoods near the core and more traditional suburban sprawl outward.

Hollywood vs. Reality: How LA’s Wilshire Subway Was Really Built

Why This Matters

Density shapes:

  • Transportation planning

  • Housing affordability

  • Infrastructure costs

  • Environmental impact

For cities like Los Angeles—now reinvesting in rail, buses, and transit-oriented development—understanding density is critical. As coverage on LA Metro and urban revival continues, these numbers explain why transit challenges in Southern California differ so sharply from those in New York or Chicago.

The Big Picture

  • Most dense city: New York City

  • Most dense metro area: Los Angeles

  • Most balanced: Chicago

Density isn’t just about how many people live in a place—it’s about how they live, move, and interact with the city around them.

Further Reading: Population Density & Urban Development

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/


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