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.
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.
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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.
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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.
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/
Two Black Pioneers Who Helped Change Heart Surgery Forever
Two Black Pioneers Who Helped Change Heart Surgery. Decades apart, Daniel Hale Williams and Vivien Thomas challenged the limits of medicine and helped pave the way toward modern cardiac surgery.
Forgotten Genius Friday: Daniel Hale Williams and Vivien Thomas helped push cardiac surgery from the nearly unthinkable toward modern medicine.
Meet two Black pioneers whose breakthroughs helped reshape cardiac surgery.
Today, open-heart surgery is performed routinely in hospitals around the world. Surgeons can repair defective valves, bypass blocked arteries and correct complex congenital heart defects using technology that would have seemed almost unimaginable little more than a century ago.
Black Pioneers Who Helped Change Heart Surgery
But the road to modern heart surgery includes two remarkable Black medical pioneers whose contributions came more than 50 years apart: Dr. Daniel Hale Williams and Vivien Thomas.
One demonstrated that surgeons could successfully intervene in injuries involving the heart at a time when such operations were considered extraordinarily dangerous.
The other helped develop an operation that opened a new era of cardiac surgery.
Their stories belong together.
Daniel Hale Williams and the 1893 Operation
In 1893, surgery was dramatically different from what patients experience today.
There were no antibiotics. Blood typing had yet to become standard medical knowledge. Modern blood transfusions, intensive-care units and heart-lung machines did not exist.
Against that backdrop, Dr. Daniel Hale Williams performed an extraordinary operation at Provident Hospital in Chicago.
Williams, born in 1856, was already breaking barriers in American medicine. He founded Provident Hospital and Training School in 1891, creating an institution where Black doctors and nurses could receive training and Black patients could obtain medical treatment at a time when segregation severely restricted their access to many hospitals.
Then came a patient named James Cornish.
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Cornish had suffered a serious stab wound to the chest. Williams opened his chest and operated on the structures surrounding the heart, including repairing the pericardium—the protective sac surrounding the heart.
Cornish survived.
The operation became one of the most celebrated moments in the history of American surgery.
Was It Really the First Open-Heart Surgery?
Here is where the history requires some clarification.
Williams is frequently credited with performing the world’s first successful open-heart operation. The U.S. National Library of Medicine, for example, describes his 1893 procedure as the world’s first open-heart surgery.
However, terminology has changed.
Under today’s medical definition, “open-heart surgery” usually refers to an operation performed directly on or inside the heart, frequently with the assistance of cardiopulmonary bypass.
Williams’s operation did not involve opening the chambers of the heart.
For that reason, describing his achievement as one of the earliest successful cardiac operations provides a more precise historical description.
That clarification doesn’t diminish Williams’s accomplishment.
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Operating successfully in the chest near the heart in 1893—without antibiotics, modern imaging, sophisticated anesthesia, blood banking or intensive postoperative care—was an extraordinary achievement.
And Williams helped demonstrate something enormously important:
The heart was not necessarily beyond the reach of surgery.
Fifty Years Later: Another Breakthrough
Fast-forward approximately half a century.
Another Black medical pioneer would play a critical role in pushing heart surgery forward.
His name was Vivien Thomas.
Thomas dreamed of becoming a doctor, but the economic devastation of the Great Depression wiped out the money he had saved for medical school.
In 1930, he began working as a laboratory assistant for surgeon Alfred Blalock at Vanderbilt University.
Thomas quickly proved extraordinarily talented at experimental surgery.
When Blalock moved to Johns Hopkins in Baltimore in 1941, Thomas went with him.
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There, Thomas would become part of one of the most important developments in the history of cardiac surgery.
The “Blue Baby” Problem
Some children are born with a combination of heart abnormalities called Tetralogy of Fallot.
Because insufficient oxygen reaches their bloodstream, severely affected children can develop a bluish coloration—leading to the historical term “blue baby syndrome.”
At the time, there was little doctors could do for many of these children.
Pediatric cardiologist Dr. Helen Taussig believed a surgical procedure might increase blood flow to the lungs and improve oxygenation.
The challenge was figuring out how to do it.
That’s where Blalock and Thomas entered the story.
Vivien Thomas Builds the Operation
Thomas performed extensive laboratory work developing and perfecting a surgical method that could redirect blood toward the lungs.
Johns Hopkins says Thomas developed and tested the procedure in animals before its first use on a human patient.
His surgical skill became so important that when the first operation was performed, Thomas was present in the operating room guiding Blalock.
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On November 29, 1944, the surgical team operated on an 18-month-old child suffering from Tetralogy of Fallot.
The operation successfully increased blood flow to the lungs. Johns Hopkins credits the procedure with eventually saving thousands of children’s lives and helping launch the modern era of cardiac surgery.
It became known for decades as the Blalock-Taussig shunt.
One name was conspicuously missing.
Thomas.
Recognition Comes Decades Later
Despite Thomas’s enormous contribution, racial discrimination shaped both his career and the recognition he received.
Thomas did not have a medical degree and initially worked under classifications and compensation that failed to reflect the sophisticated surgical research he was actually performing.
His role in developing the operation also wasn’t properly credited in the original published account of the procedure. Johns Hopkins itself now describes Thomas as an essential pioneer and notes that he was not given credit when details of the surgery were published in 1945.
Recognition eventually came.
In 1976, Johns Hopkins awarded Thomas an honorary Doctor of Laws degree, and his portrait was placed at the institution.
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Even more significantly, Johns Hopkins today incorporates his name into the Blalock-Taussig-Thomas Pediatric and Congenital Heart Center.
History finally added the name that had been missing.
Two Men, Two Eras, One Medical Revolution
Daniel Hale Williams and Vivien Thomas never worked together.
Their breakthroughs happened more than five decades apart.
Their careers were very different.
Williams was a physician, surgeon, hospital founder and medical educator.
Thomas never received the opportunity to become the physician he originally hoped to be, yet became a master surgical technician, researcher and teacher whose skills influenced generations of surgeons.
But their stories intersect in the history of cardiac surgery.
1893 — Daniel Hale Williams demonstrated that extraordinary surgical intervention around the heart could succeed.
1944 — Vivien Thomas helped develop a procedure that demonstrated surgeons could deliberately alter cardiovascular circulation to save children born with serious heart defects.
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The 1944 breakthrough was so important that Johns Hopkins describes it as opening the door to today’s heart surgery.
Neither achievement was modern open-heart surgery as we understand it today. The development of cardiopulmonary bypass and the heart-lung machine during the following decade would make operations inside a temporarily stopped heart practical.
But Williams and Thomas helped establish something equally important:
the possibility that surgeons could successfully intervene when the human heart itself was at risk.
Their contributions helped transform cardiac surgery from a medical frontier into one of modern medicine’s most remarkable achievements.
Forgotten Genius Friday
Forgotten Genius Friday celebrates innovators, inventors, scientists and pioneers whose contributions helped shape our modern world but whose names aren’t always as familiar as their accomplishments.
Did you know about Daniel Hale Williams or Vivien Thomas? Join the conversation in the comments, share this story and subscribe to the STM Daily News newsletter for more stories about the people who helped change history.
Johns Hopkins Medicine — History of Innovation in Cardiac Surgery Documents Vivien Thomas’s role in developing the Blue Baby procedure and the historic November 29, 1944 operation. Johns Hopkins describes it as the beginning of a new era in cardiac surgery. Johns Hopkins Cardiac Surgery Research Lab History
Related External Links
Johns Hopkins — Innovations in Heart Medicine Explains how Thomas, Alfred Blalock, Helen Taussig and their colleagues developed the Blue Baby operation and how it helped open the door to modern cardiac surgery. Innovations in Heart Medicine
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Johns Hopkins — Vivien Thomas Biography Especially useful for the Forgotten Genius angle. Johns Hopkins states that Thomas developed and tested the procedure in animals and stood behind Blalock guiding him during the first human operation; Thomas was not credited in the original published report. Vivien Thomas — Johns Hopkins Medicine
Johns Hopkins — Celebrating a Transformative Medical Milestone A detailed account of the first Blue Baby operation on 18-month-old Eileen Saxon in 1944 and Thomas’s role in the operating room. 75th Anniversary of the Blue Baby Operation
PubMed — Daniel Hale Williams in Proper Perspective A useful scholarly source confirming that Williams successfully sutured a pericardial laceration caused by a stab wound in 1893 and that the patient recovered. Daniel Hale Williams — PubMed
NIH/PMC — Cardiac Surgery: A Century of Progress Provides broader historical context and notes that Williams’s 1893 operation was among the earliest successful repairs of pericardial wounds, following Henry C. Dalton’s 1891 operation. This is particularly valuable for avoiding the oversimplified claim that Williams indisputably performed history’s first heart operation. Cardiac Surgery: A Century of Progress
Roscoe’s Chicken and Waffles: An L.A. Institution Confronts a Complicated Legacy
Roscoe’s Chicken and Waffles grew from a Harlem-inspired restaurant into a symbol of Black Los Angeles. Fifty years later, lawsuits, bankruptcy, closures and questions about its leadership have complicated the celebrated chain’s legacy.
For generations of Southern Californians, Roscoe’s was more than a famous combination of fried chicken and waffles. After 50 years, the restaurant’s cultural importance remains—but lawsuits, bankruptcy, closures and questions about its leadership have complicated the story.Founded by Herb Hudson in 1975, Roscoe’s became one of Southern California’s most recognizable soul-food institutions.
What Happened to Roscoe’s Chicken and Waffles?
For many visitors to Los Angeles, Roscoe’s House of Chicken and Waffles is a destination—one of those famous places they have seen in movies, heard about in songs or watched celebrities visit.
For many of us who grew up in Los Angeles County, however, Roscoe’s occupies a different place in our memories. It was not necessarily our introduction to soul food, nor was chicken and waffles an exotic discovery. Roscoe’s was one among many soul-food restaurants where families ate in South Los Angeles, Inglewood, Compton, Watts and Long Beach.
I ate food from the South L.A. and Inglewood restaurants when I was young, although I was too young to compare the locations. When I returned to Roscoe’s as an adult and ate at the Long Beach location in 2021, I thought the food was good. That experience connected a familiar name from my Southern California childhood with the restaurant Roscoe’s had become decades later.
But the Roscoe’s story today is no longer only about food and nostalgia. It is also about how a Black cultural institution manages its legacy after lawsuits, bankruptcy proceedings, restaurant closures and a public controversy that caused some longtime customers to question who now controls the business—and whether its leadership still understands the community that helped make Roscoe’s famous.
From Harlem inspiration to a West Coast phenomenon
Herbert “Herb” Hudson, a Harlem native and former General Motors foreman, founded Roscoe’s in 1975. Accounts differ on whether the first restaurant was in Hollywood or Long Beach: Roscoe’s official history identifies the company as Hollywood-based, while culinary historian Adrian Miller and several contemporary reports place Hudson’s first location in Long Beach. What is undisputed is that Hudson brought a Harlem-influenced restaurant concept to Southern California and turned it into something distinctly Angeleno.
Hudson drew inspiration from the chicken-and-waffle restaurants and late-night music culture associated with Harlem, particularly Wells Supper Club. Chicken and waffles existed long before either Wells or Roscoe’s, with roots stretching through Pennsylvania Dutch cooking, Southern foodways and the work of Black cooks. Roscoe’s achievement was not inventing the pairing. It was making fried chicken and waffles a recognizable part of Los Angeles dining and eventually a national phenomenon.
In a 1978 advertisement in the Los Angeles Sentinel, Roscoe’s described the dish as “an East Coast specialty with a West Coast atmosphere.” It was an effective summary of Hudson’s idea.
His entertainment connections helped carry the restaurant beyond its neighborhood base. Stevie Wonder, Natalie Cole and comedian Redd Foxx were associated with its early rise, while athletes, actors, musicians and political figures followed. Roscoe’s became a place where local customers, tourists and celebrities could occupy the same dining room.
The restaurant also offered far more than its headline combination. Grits, eggs, greens, macaroni and cheese, red beans and rice, hot-water cornbread and chicken livers helped place Roscoe’s within the larger soul-food tradition. James Beard Award-winning author Adrian Miller’s history of Roscoe’s describes how Hudson used Black media, music connections and neighborhood locations to build the company.
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Becoming part of Black Los Angeles
Roscoe’s did not become an institution merely because famous people ate there. Black Los Angeles made it an institution.
Families celebrated there. Musicians stopped in after performances. Local residents brought visiting relatives. Young people grew up knowing the name before national food television began treating chicken and waffles as a culinary discovery.
Roscoe’s also entered popular culture. It was referenced in movies including Jackie Brown, Rush Hour and Soul Plane, appeared in television productions and was mentioned in music. Its yellow-and-red signs became visual shorthand for a particular side of Los Angeles—one connected to Black culture, nightlife and neighborhood life rather than beaches and Hollywood premieres.
President Barack Obama’s 2011 visit to the Pico Boulevard restaurant represented a high point in that cultural journey. Obama ordered three wings and a waffle, and the meal became known as the “Obama’s Special.” A restaurant created by a Black entrepreneur and sustained heavily by Black customers had served the nation’s first Black president.
Roscoe’s fame, however, could sometimes obscure the larger community around it. Los Angeles has long supported many soul-food kitchens, family restaurants and neighborhood establishments. Roscoe’s became the name outsiders recognized, but it was never the whole story of soul food in Southern California.
The discrimination case and bankruptcy
The most consequential legal chapter began with former employee Daniel Beasley, a Black man who sued East Coast Foods, the company managing several Roscoe’s restaurants.
Beasley alleged that Latino managers gave Latino employees preferential schedules and working conditions while treating Black workers unfairly. He also alleged that he was terminated after complaining about discrimination. A jury found in his favor, and the resulting judgment was ultimately reported at approximately $3.2 million.
This was a particularly damaging case for Roscoe’s reputation. The allegations did not come from an outside critic attacking a Black-owned institution. They came from a Black employee accusing the company behind that institution of failing Black workers.
East Coast Foods filed for Chapter 11 bankruptcy protection in 2016. The discrimination judgment was a major factor, but it was not the company’s only financial obligation. Court proceedings described millions of dollars in additional debt.
The restructuring grew complicated. An examiner concluded that East Coast Foods could not meet its fiduciary responsibilities, and a court-appointed trustee effectively led the company for two years. A bankruptcy judge also ordered Hudson to reverse a transfer of the Roscoe’s name and trademark to an affiliated company he controlled, finding the transfer improper under bankruptcy law.
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A restructuring plan took effect in September 2018. It promised creditors full payment with interest, secured by company assets and as much as $10 million from Hudson. The restaurants remained open. The U.S. Court of Appeals for the Ninth Circuit later summarized the proceedings and Hudson’s guarantee.
The bankruptcy is important when discussing claims that Roscoe’s “changed hands.” Court supervision, the temporary appointment of a trustee and the emergence of new executives clearly changed how parts of the company were controlled. However, available reporting does not establish a straightforward sale of the entire chain to a new owner.
That distinction matters. Social-media posts frequently describe Roscoe’s as no longer Black-owned, but the company has not publicly provided a clear, current breakdown of its ownership. The most accurate conclusion is that Roscoe’s corporate structure and leadership became more complicated and less transparent—not that a complete sale has been conclusively documented.
A second employee lawsuit
Roscoe’s faced another labor case in January 2024 when former employee Jaime Alejandro Carbajal-Torres filed a proposed class-action lawsuit in Los Angeles Superior Court.
Carbajal-Torres, who said he worked for the company for more than 20 years, alleged unpaid overtime, interrupted or missed meal and rest periods, unpaid vacation wages and unreimbursed work expenses. The complaint sought class-action status, unspecified damages and an injunction against further violations of California labor law.
These are allegations in a civil complaint, not proven findings, and Roscoe’s did not immediately respond to the original request for comment, according to L.A. Taco’s report.
Nevertheless, the filing revived uncomfortable questions about the treatment of the people whose labor sustains a celebrated restaurant brand. For a company whose identity is tied so strongly to community, repeated employee complaints cannot simply be dismissed as a public-relations inconvenience.
Closures, tragedy and public controversy
The last several years have brought additional challenges.
Roscoe’s closed its celebrated Pico Boulevard restaurant in January 2023 after approximately 32 years. The company directed customers to its newer La Brea flagship, which opened in 2021. In June 2024, the Pasadena restaurant closed after 30 years, although the company said it hoped to find an upgraded location in the city. The Los Angeles Times reported that some customers had begun questioning whether rising prices still matched the food’s quality.
The chain was also touched by tragedy in September 2022 when rapper PnB Rock was shot and killed during a robbery at the Manchester Avenue restaurant. That killing was not a business controversy created by Roscoe’s, but it attached another painful chapter to the restaurant’s recent history.
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Then, in November 2024, a large inflatable figure of Donald Trump appeared near the Long Beach restaurant. Images spread online, leading some customers to believe Roscoe’s was endorsing Trump and prompting calls for a boycott.
Roscoe’s COO and creative director Diane Vara said the inflatable was connected to a political watch party at an adjacent jazz lounge, not the restaurant itself. According to Eater Los Angeles, the event was hosted by the Los Angeles County Republican Party and URBT News at the neighboring venue.
That explanation did not fully settle the controversy. Vara, who described herself publicly as a partner in Roscoe’s, had also exchanged contentious social-media comments with a food creator who criticized the restaurant and shared a homemade chicken-and-waffle recipe. The tone of the response intensified existing doubts about the company’s ownership, values and relationship with its traditional customers.
For many longtime patrons, the reaction was about more than partisan politics. Roscoe’s had spent decades benefiting from its status as a symbol of Black Los Angeles. Customers therefore expected its leadership to recognize how its actions—or events appearing to be associated with its property—would be understood by that community.
The state of Roscoe’s today
Roscoe’s reached its 50th anniversary in 2025. Its official website currently lists Hollywood, South L.A., Long Beach, Inglewood-LAX, Anaheim, La Brea and Pasadena, although the old Pasadena restaurant closed in 2024 and the company has discussed seeking a replacement site.
There are also signs of continued ambition. Roscoe’s has signed a lease for a space of more than 3,000 square feet at Los Angeles Union Station, according to 2026 reporting, though no firm public opening date had been announced. A Union Station restaurant would place Roscoe’s inside one of Southern California’s most important transportation landmarks as Los Angeles prepares for the 2028 Olympic and Paralympic Games.
This means Roscoe’s is not simply disappearing. It is contracting in some places, repositioning itself in others and attempting to carry a famous name into a new era.
But survival is not the same as renewal.
Roscoe’s still possesses something most restaurants could never purchase: a half-century of cultural memory. It helped popularize chicken and waffles across the country. It provided a gathering place for generations of Angelenos. It became one of the most recognizable Black-founded restaurant brands in America.
That history deserves recognition—but it should not shield the company from scrutiny.
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To retain the loyalty of the community that built it, Roscoe’s needs greater clarity about its ownership and leadership, fair treatment of its workers, consistent food and service, and a more thoughtful relationship with longtime customers. Nostalgia can bring people back once. Trust is what keeps them returning.
Roscoe’s remains an L.A. institution. The question now is whether the company managing that institution understands the responsibility that comes with the name.
Editor’s note: This article distinguishes court findings from allegations. Claims in the 2024 labor complaint remain allegations unless proven in court or resolved through an acknowledged settlement. Publicly available reporting does not conclusively establish that the entire Roscoe’s chain was sold or ceased to be Black-owned.
