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.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.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/
Century City: From Hollywood Backlot to Business Hub
Century City, originally part of 20th Century Fox’s backlot, transformed into a prominent business district in Los Angeles during the 1950s amid the decline of cinema. Developer William Zeckendorf envisioned a mixed-use urban center, leading to iconic skyscrapers and establishing the area as a hub for law, finance, and media, blending Hollywood history with modern business.
Before Century City became one of Los Angeles’ premier business districts, it was part of 20th Century Fox’s sprawling backlot, used for filming movies and housing studio operations. By the 1950s, as television rose and movie attendance declined, 20th Century Fox faced financial challenges and decided to sell a portion of its land.
Traffic On 405 Freeway In LA With Century City In The Background
Developer William Zeckendorf envisioned a “city within a city”—a modern, mixed-use urban center with office towers, hotels, and entertainment facilities. Branded Century City, the name paid homage to its studio roots while symbolizing LA’s vision for the future.
The first skyscrapers, including the Gateway West Building, set the tone for the district’s sleek, futuristic skyline. Architects like Welton Becket and Minoru Yamasaki helped shape Century City’s iconic look. Over time, it evolved from Hollywood’s backlot to a corporate and legal hub, attracting law firms, financial institutions, and media companies.
Today, Century City stands as a testament to Los Angeles’ postwar optimism, westward expansion, and multi-centered urban growth—a unique blend of Hollywood history and modern business.
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/
A young George Washington was thrust into the dense, contested wilderness of the Ohio River Valley as a land surveyor for real estate development companies in Virginia. Henry Hintermeister/Public domain via Wikimedia Commons
This Presidents Day, I’ve been thinking about George Washington − not at his finest hour, but possibly at his worst.
In 1754, a 22-year-old Washington marched into the wilderness surrounding Pittsburgh with more ambition than sense. He volunteered to travel to the Ohio Valley on a mission to deliver a letter from Robert Dinwiddie, governor of Virginia, to the commander of French troops in the Ohio territory. This military mission sparked an international war, cost him his first command and taught him lessons that would shape the American Revolution.
As a professor of early American history who has written two books on the American Revolution, I’ve learned that Washington’s time spent in the Fort Duquesne area taught him valuable lessons about frontier warfare, international diplomacy and personal resilience.
The mission to expel the French
In 1753, Dinwiddie decided to expel French fur trappers and military forces from the strategic confluence of three mighty waterways that crisscrossed the interior of the continent: the Allegheny, Monongahela and Ohio rivers. This confluence is where downtown Pittsburgh now stands, but at the time it was wilderness.
King George II authorized Dinwiddie to use force, if necessary, to secure lands that Virginia was claiming as its own.
As a major in the Virginia provincial militia, Washington wanted the assignment to deliver Dinwiddie’s demand that the French retreat. He believe the assignment would secure him a British army commission.
Washington received his marching orders on Oct. 31, 1753. He traveled to Fort Le Boeuf in northwestern Pennsylvania and returned a month later with a polite but firm “no” from the French.George Washington held an honorary commission as a major in the British army prior to the French and Indian War. Dea/M. Seemuller/De Agostini collection/Getty Images
Dinwiddie promoted Washington from major to lieutenant colonel and ordered him to return to the Ohio River Valley in April 1754 with 160 men. Washington quickly learned that French forces of about 500 men had already constructed the formidable Fort Duquesne at the forks of the Ohio. It was at this point that he faced his first major test as a military leader. Instead of falling back to gather more substantial reinforcements, he pushed forward. This decision reflected an aggressive, perhaps naive, brand of leadership characterized by a desire for action over caution.
Washington’s initial confidence was high. He famously wrote to his brother that there was “something charming” in the sound of whistling bullets.
The Jumonville affair and an international crisis
Perhaps the most controversial moment of Washington’s early leadership occurred on May 28, 1754, about 40 miles south of Fort Duquesne. Guided by the Seneca leader Tanacharison – known as the “Half King” – and 12 Seneca warriors, Washington and his detachment of 40 militiamen ambushed a party of 35 French Canadian militiamen led by Ensign Joseph Coulon de Jumonville. The Jumonville affair lasted only 15 minutes, but its repercussions were global.The Jumonville affair became the opening battle of the French and Indian War. Interim Archives/Archive Collection/Getty Images
Ten of the French, including Jumonville, were killed. Washington’s inability to control his Native American allies – the Seneca warriors executed Jumonville – exposed a critical gap in his early leadership. He lacked the ability to manage the volatile intercultural alliances necessary for frontier warfare.
Washington also allowed one enemy soldier to escape to warn Fort Duquesne. This skirmish effectively ignited the French and Indian War, and Washington found himself at the center of a burgeoning international crisis.
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Defeat at Fort Necessity
Washington then made the fateful decision to dig in and call for reinforcements instead of retreating in the face of inevitable French retaliation. Reinforcements arrived: 200 Virginia militiamen and 100 British regulars. They brought news from Dinwiddie: congratulations on Washington’s victory and his promotion to colonel.
His inexperience showed in his design of Fort Necessity. He positioned the small, circular palisade in a meadow depression, where surrounding wooded high ground allowed enemy marksmen to fire down with impunity. Worse still, Tanacharison, disillusioned with Washington’s leadership and the British failure to follow through with promised support, had already departed with his warriors weeks earlier. When the French and their Native American allies finally attacked on July 3, heavy rains flooded the shallow trenches, soaking gunpowder and leaving Washington’s men vulnerable inside their poorly designed fortification.Washington was outnumbered and outmaneuvered at Fort Necessity. Interim Archives/Archive Collection/Getty Images
The battle of Fort Necessity was a grueling, daylong engagement in the mud and rain. Approximately 700 French and Native American allies surrounded the combined force of 460 Virginian militiamen and British regulars. Despite being outnumbered and outmaneuvered, Washington maintained order among his demoralized troops. When French commander Louis Coulon de Villiers – Jumonville’s brother – offered a truce, Washington faced the most humbling moment of his young life: the necessity of surrender. His decision to capitulate was a pragmatic act of leadership that prioritized the survival of his men over personal honor.
The surrender also included a stinging lesson in the nuances of diplomacy. Because Washington could not read French, he signed a document that used the word “l’assassinat,” which translates to “assassination,” to describe Jumonville’s death. This inadvertent admission that he had ordered the assassination of a French diplomat became propaganda for the French, teaching Washington the vital importance of optics in international relations.A log cabin used to protect the perishable supplies still stands at Fort Necessity today. MyLoupe/Universal Images Group/Getty Images
Lessons that forged a leader
The 1754 campaign ended in a full retreat to Virginia, and Washington resigned his commission shortly thereafter. Yet, this period was essential in transforming Washington from a man seeking personal glory into one who understood the weight of responsibility.
He learned that leadership required more than courage – it demanded understanding of terrain, cultural awareness of allies and enemies, and political acumen. The strategic importance of the Ohio River Valley, a gateway to the continental interior and vast fur-trading networks, made these lessons all the more significant.
Ultimately, the hard lessons Washington learned at the threshold of Fort Duquesne in 1754 provided the foundational experience for his later role as commander in chief of the Continental Army. The decisions he made in Pennsylvania and the Ohio wilderness, including the impulsive attack, the poor choice of defensive ground and the diplomatic oversight, were the very errors he would spend the rest of his military career correcting.
Though he did not capture Fort Duquesne in 1754, the young George Washington left the woods of Pennsylvania with a far more valuable prize: the tempered, resilient spirit of a leader who had learned from his mistakes.
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/
The Building That Proved Los Angeles Could Go Vertical
Los Angeles once banned skyscrapers, yet City Hall broke the height limit and proved high-rise buildings could be engineered safely in an earthquake zone.
How City Hall Quietly Undermined LA’s Own Height Limits
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For more than half a century, Los Angeles enforced one of the strictest building height limits in the United States. Beginning in 1905, most buildings were capped at 150 feet, shaping a city that grew outward rather than upward.
The goal was clear: avoid the congestion, shadows, and fire dangers associated with dense Eastern cities. Los Angeles sold itself as open, sunlit, and horizontal — a place where growth spread across land, not into the sky.
And yet, in 1928, Los Angeles City Hall rose to 454 feet, towering over the city like a contradiction in concrete.
It wasn’t built to spark a commercial skyscraper boom. But it ended up proving that Los Angeles could safely build one.
A Rule Designed to Prevent a Manhattan-Style City
The original height restriction was rooted in early 20th-century fears:
Limited firefighting capabilities
Concerns over blocked sunlight and airflow
Anxiety about congestion and overcrowding
A strong desire not to resemble New York or Chicago
Los Angeles wanted prosperity — just not vertical density.
The height cap reinforced a development model where:
Office districts stayed low-rise
Growth moved outward
Automobiles became essential
Downtown never consolidated into a dense core
This philosophy held firm even as other American cities raced upward.
Los Angeles banned skyscrapers for decades — except one. 🏛️ While most buildings were capped at 150 feet, LA City Hall rose three times higher. This wasn’t a loophole — it was power, symbolism, and city planning shaping the skyline we know today. Why was City Hall the exception? And how did this one decision change Los Angeles forever? 📍 Forgotten LA 🧠 The Knowledge Series 📰 STM Daily News LosAngelesHistory LACityHall ForgottenLA UrbanPlanning CityPlanning LASkyline DidYouKnow HistoryTok TheKnowledge STMDailyNews ♬ original sound – STMDailyNews – STMDailyNews
Why City Hall Was Never Meant to Change the Rules
City Hall was intentionally exempt from the height limit because the law applied primarily to private commercial buildings, not civic monuments.
But city leaders were explicit about one thing: City Hall was not a precedent.
It was designed to:
Serve as a symbolic seat of government
Stand alone as a civic landmark
Represent stability, authority, and modern governance
Avoid competing with private office buildings
In effect, Los Angeles wanted a skyline icon — without a skyline.
Innovation Hidden in Plain Sight
What made City Hall truly significant wasn’t just its height — it was how it was built.
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At a time when seismic science was still developing, City Hall incorporated advanced structural ideas for its era:
A steel-frame skeleton designed for flexibility
Reinforced concrete shear walls for lateral strength
A tapered tower to reduce wind and seismic stress
Thick structural cores that distributed force instead of resisting it rigidly
These choices weren’t about aesthetics — they were about survival.
The Earthquake That Changed the Conversation
In 1933, the Long Beach earthquake struck Southern California, causing widespread damage and reshaping building codes statewide.
Los Angeles City Hall survived with minimal structural damage.
This moment quietly reshaped the debate:
A tall building had endured a major earthquake
Structural engineering had proven effective
Height alone was no longer the enemy — poor design was
City Hall didn’t just survive — it validated a new approach to vertical construction in seismic regions.
Proof Without Permission
Despite this success, Los Angeles did not rush to repeal its height limits.
Cultural resistance to density remained strong, and developers continued to build outward rather than upward. But the technical argument had already been settled.
City Hall stood as living proof that:
High-rise buildings could be engineered safely in Los Angeles
Earthquakes were a challenge, not a barrier
Fire, structural, and seismic risks could be managed
The height restriction was no longer about safety — it was about philosophy.
The Ironic Legacy
When Los Angeles finally lifted its height limit in 1957, the city did not suddenly erupt into skyscrapers. The habit of building outward was already deeply entrenched.
The result:
A skyline that arrived decades late
Uneven density across the region
Multiple business centers instead of one core
Housing and transit challenges baked into the city’s growth pattern
City Hall never triggered a skyscraper boom — but it quietly made one possible.
Why This Still Matters
Today, Los Angeles continues to wrestle with:
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Housing shortages
Transit-oriented development debates
Height and zoning battles near rail corridors
Resistance to density in a growing city
These debates didn’t begin recently.
They trace back to a single contradiction: a city that banned tall buildings — while proving they could be built safely all along.
Los Angeles City Hall wasn’t just a monument. It was a test case — and it passed.
