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Sunflowers make small moves to maximize their Sun exposure – physicists can model them to predict how they grow
Charles Darwin’s detailed observations of plant movements, such as sunflower circumnutation and self-organization, reveal how randomness helps plants optimize growth and adapt to their environments. Sunflowers!
Last Updated on March 6, 2026 by Daily News Staff
Chantal Nguyen, University of Colorado Boulder
Sunflowers make small moves to maximize their Sun exposure – physicists can model them to predict how they grow
Most of us aren’t spending our days watching our houseplants grow. We see their signs of life only occasionally – a new leaf unfurled, a stem leaning toward the window.
But in the summer of 1863, Charles Darwin lay ill in bed, with nothing to do but watch his plants so closely that he could detect their small movements to and fro. The tendrils from his cucumber plants swept in circles until they encountered a stick, which they proceeded to twine around.
“I am getting very much amused by my tendrils,” he wrote.
This amusement blossomed into a decadeslong fascination with the little-noticed world of plant movements. He compiled his detailed observations and experiments in a 1880 book called “The Power of Movement in Plants.”
In one study, he traced the motion of a carnation leaf every few hours over the course of three days, revealing an irregular looping, jagged path. The swoops of cucumber tendrils and the zags of carnation leaves are examples of inherent, ubiquitous plant movements called circumnutations – from the Latin circum, meaning circle, and nutare, meaning to nod.
Circumnutations vary in size, regularity and timescale across plant species. But their exact function remains unclear.
I’m a physicist interested in understanding collective behavior in living systems. Like Darwin, I’m captivated by circumnutations, since they may underlie more complex phenomena in groups of plants.
Sunflower patterns
A 2017 study revealed a fascinating observation that got my colleagues and me wondering about the role circumnutations could play in plant growth patterns. In this study, researchers found that sunflowers grown in a dense row naturally formed a near-perfect zigzag pattern, with each plant leaning away from the row in alternating directions.
This pattern allowed the plants to avoid shade from their neighbors and maximize their exposure to sunlight. These sunflowers flourished.
Researchers then planted some plants at the same density but constrained them so that they could grow only upright without leaning. These constrained plants produced less oil than the plants that could lean and get the maximum amount of sun.
While farmers can’t grow their sunflowers quite this close together due to the potential for disease spread, in the future they may be able to use these patterns to come up with new planting strategies.
Self-organization and randomness
This spontaneous pattern formation is a neat example of self-organization in nature. Self-organization refers to when initially disordered systems, such as a jungle of plants or a swarm of bees, achieve order without anything controlling them. Order emerges from the interactions between individual members of the system and their interactions with the environment.
Somewhat counterintuitively, noise – also called randomness – facilitates self-organization. Consider a colony of ants.
Ants secrete pheromones behind them as they crawl toward a food source. Other ants find this food source by following the pheromone trails, and they further reinforce the trail they took by secreting their own pheromones in turn. Over time, the ants converge on the best path to the food, and a single trail prevails.
But if a shorter path were to become possible, the ants would not necessarily find this path just by following the existing trail.
If a few ants were to randomly deviate from the trail, though, they might stumble onto the shorter path and create a new trail. So this randomness injects a spontaneous change into the ants’ system that allows them to explore alternative scenarios.
Eventually, more ants would follow the new trail, and soon the shorter path would prevail. This randomness helps the ants adapt to changes in the environment, as a few ants spontaneously seek out more direct ways to their food source.
In biology, self-organized systems can be found at a range of scales, from the patterns of proteins inside cells to the socially complex colonies of honeybees that collectively build nests and forage for nectar.
Randomness in sunflower self-organization
So, could random, irregular circumnutations underpin the sunflowers’ self-organization?
My colleagues and I set out to explore this question by following the growth of young sunflowers we planted in the lab. Using cameras that imaged the plants every five minutes, we tracked the movement of the plants to see their circumnutatory paths.
We saw some loops and spirals, and lots of jagged movements. These ultimately appeared largely random, much like Darwin’s carnation. But when we placed the plants together in rows, they began to move away from one another, forming the same zigzag configurations that we’d seen in the previous study.
We analyzed the plants’ circumnutations and found that at any given time, the direction of the plant’s motion appeared completely independent of how it was moving about half an hour earlier. If you measured a plant’s motion once every 30 minutes, it would appear to be moving in a completely random way.
We also measured how much the plant’s leaves grew over the course of two weeks. By putting all of these results together, we sketched a picture of how a plant moved and grew on its own. This information allowed us to computationally model a sunflower and simulate how it behaves over the course of its growth.
A sunflower model
We modeled each plant simply as a circular crown on a stem, with the crown expanding according to the growth rate we measured experimentally. The simulated plant moved in a completely random way, taking a “step” every half hour.
We created the model sunflowers with circumnutations of lower or higher intensity by tweaking the step sizes. At one end of the spectrum, sunflowers were much more likely to take tiny steps than big ones, leading to slow, minimal movement on average. At the other end were sunflowers that are equally as likely to take large steps as small steps, resulting in highly irregular movement. The real sunflowers we observed in our experiment were somewhere in the middle.
Plants require light to grow and have evolved the ability to detect shade and alter the direction of their growth in response.
We wanted our model sunflowers to do the same thing. So, we made it so that two plants that get too close to each other’s shade begin to lean away in opposite directions.
Finally, we wanted to see whether we could replicate the zigzag pattern we’d observed with the real sunflowers in our model.
First, we set the model sunflowers to make small circumnutations. Their shade avoidance responses pushed them away from each other, but that wasn’t enough to produce the zigzag – the model plants stayed stuck in a line. In physics, we would call this a “frustrated” system.
Then, we set the plants to make large circumnutations. The plants started moving in random patterns that often brought the plants closer together rather than farther apart. Again, no zigzag pattern like we’d seen in the field.
But when we set the model plants to make moderately large movements, similar to our experimental measurements, the plants could self-organize into a zigzag pattern that gave each sunflower optimal exposure to light.
So, we showed that these random, irregular movements helped the plants explore their surroundings to find desirable arrangements that benefited their growth.
Plants are much more dynamic than people give them credit for. By taking the time to follow them, scientists and farmers can unlock their secrets and use plants’ movement to their advantage.
Chantal Nguyen, Postdoctoral Associate at the BioFrontiers Institute, University of Colorado Boulder
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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amusement and theme parks
Six Flags and Travis Kelce Kick Off 2027 Season Pass Sales With Lowest Prices Through Sept. 7
Six Flags launches 2027 Season Pass sales at its lowest price through Sept. 7, with unlimited visits now through 2027, parking perks, and regional access.
Six Flags is officially in “season pass season” — and it’s starting with a headline deal. The company announced Aug. 7 that it has launched sales of its 2027 Season Passes at the lowest price guests will see this season or next, with a limited-time offer running through Sept. 7, 2026. To mark the 8/7 launch date, Six Flags teamed up with brand ambassador Travis Kelce, celebrating the biggest pass offer of the year on a number that’s become part of his legacy.
The big takeaway for fans: buy early, and you’re not just locking in 2027 access — you’re getting the rest of 2026, too. That includes major seasonal events like Halloween and holiday celebrations, plus the chance to start using the pass right away across participating parks.
What the 2027 Season Pass deal includes
Guests can purchase a 2027 Gold Pass or Prestige Pass at launch pricing and receive admission for the remainder of 2026 and all of 2027.
Kelce framed it in simple terms: unlimited visits, especially heading into fall and winter event season, is the kind of value that would have been “mind-blowing” as a kid — and it’s built for families and friend groups who want more reasons to get together.
Gold Pass: the value play for frequent park visits
The 2027 Gold Pass is positioned as the core option for guests who want maximum visits at the lowest price point. Benefits include:
- Unlimited visits for the rest of 2026 and all of 2027
- Free general parking (restrictions apply)
- Regional park access (East, West, Midwest, or Texas)
- Admission to fall haunt events and seasonal holiday celebrations
- Discounts on select food, merchandise, and tickets
- One bonus Bring-A-Friend Free ticket for renewing passholders and new members who purchase by Sept. 7
Prestige Pass: VIP perks and nationwide access
For guests who want more premium access and in-park benefits, Six Flags is also pushing its Prestige Pass tier. Prestige perks include:
- Access to all Six Flags parks across North America
- Preferred parking at many parks
- Complimentary fountain beverages
- VIP entrance access at participating parks
- Free Bring-A-Friend tickets
- One free single-use Fast Lane per visit
- A $20 in-park credit for new Prestige members and Prestige passholders who renew by Sept. 7
Memberships: month-to-month flexibility
Six Flags also announced 2027 Memberships for guests who prefer a monthly payment option. Memberships include unlimited visits and a range of benefits similar to Season Passes — including multi-park access (based on tier), parking benefits, discounts on food and merchandise, and member-exclusive rewards and offers.
Premium membership tiers add expanded park access and additional VIP-style perks, giving guests more ways to customize how they visit.
Why Six Flags is making a big push now
The 2027 pass launch arrives as Six Flags prepares what it calls one of its most ambitious attraction lineups ever, with major additions planned across regions.
Highlights announced so far include:
- East: Six Flags Great Adventure will debut Bakunawa, billed as the world’s tallest and fastest spinning coaster (382 feet, 100 mph), anchoring a renovated Boardwalk area inspired by Jersey Shore culture. Carowinds will introduce Rip Roarin’ Falls, a super-flume featuring a 100-foot drop.
- Texas: Six Flags Fiesta Texas will debut Werewolf Gorge, described as the world’s longest family launch coaster with immersive storytelling.
- Midwest: Six Flags Great America will open Camp Timber Trail, a family adventure area anchored by Sky Hawk, a suspended family coaster.
- West: Knott’s Soak City will introduce Coral Craze and Kelp Kraze, new family raft slides featuring ride systems making their West Coast and North American debuts.
Six Flags also teased that more major announcements are still on the way.
You can start using the pass in 2026 — and more is coming
Beyond the 2027 pipeline, Six Flags says guests who buy now can take advantage of new or recently opened additions in 2026, including:
- Quantum Accelerator (Six Flags New England)
- Tormenta: Rampaging Run (Six Flags Over Texas)
- Shoreline Pier (Six Flags Great Adventure)
- Daredeviler (Canada’s Wonderland)
- Speedway Stunt Coaster (Six Flags Mexico)
- Looney Tunes™ Land (Six Flags Magic Mountain)
- Phantom Theater (Kings Island)
- A major summer entertainment lineup (Kings Dominion)
And the calendar doesn’t slow down after summer. Six Flags says its 2026 Halloween lineup is coming soon, featuring new horror franchise experiences and new entertainment, followed by holiday events across parks — including the return of a newly reimagined Holiday in the Park at Six Flags Great Adventure and Six Flags Over Georgia.
The deadline to know
If you’re considering a pass, the timing matters: guests must purchase by Sept. 7, 2026 to receive launch pricing and promotional offers. For park-specific details and restrictions, Six Flags directs guests to visit sixflags.com.
For fans, Kelce summed up the pitch: more time at the parks now means more memories later — more rides, more laughs, and more reasons to bring your crew along for the season.
Source: Six Flags
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ABCs for School Zone Safety: Tips for Drivers, Pedestrians and Bicyclists
School Zone Safety: A new school year means there’s more traffic around school campuses. Between dropoffs and pickups, children riding bicycles, walking to school and all the shuttling between sports practices and other extracurricular activities, this season is a reminder to make every trip to and from school a safe one.
ABCs for School Zone Safety: Tips for Drivers, Pedestrians and Bicyclists
(Feature Impact) A new school year means there’s more traffic around school campuses. Between dropoffs and pickups, children riding bicycles, walking to school and all the shuttling between sports practices and other extracurricular activities, this season is a reminder to make every trip to and from school a safe one.
To make sure no parent worries about their child getting to school safely, the California Office of Traffic Safety (OTS) and Caltrans are encouraging drivers, pedestrians and bicyclists to remember their “ABCs” on every trip: stay Alert for Bicyclists and watch for and yield to Children crossing the street.
With students in school and traffic patterns changing, consider these tips so students arrive to and from class safely:
Drivers
Because children outside of vehicles do not have the same protections as drivers and passengers, drivers have an outsized role to protect people walking, biking and rolling.
- Take your time and be patient.
- Always follow the speed limit.
- Use extra caution at crosswalks and intersections, especially if you notice children nearby.
- Don’t drive distracted – even a quick glance at your phone can have tragic consequences.
- Never drive while impaired.
- Adjust your driving to the conditions and use extra caution in rain, fog and darkness.
- If you see a bicyclist ahead, wait until it’s safe to pass and give them at least 3 feet of space when you do.
Pedestrians
Pedestrians have an important role in their own safety, particularly in school zones and crosswalks where children and other people may be present.
- Use sidewalks when available. If there are no sidewalks, walk facing traffic so you can see drivers and they can see you.
- Avoid crossing outside of crosswalks. If there is a signalized crosswalk or marked crosswalk, use it.
- Before crossing the street, look both ways. If there are any stopped or turning cars, try to make eye contact with the drivers before crossing so you know they see you.
- If you’re walking after dark or when visibility is poor, make yourself visible by wearing something bright or reflective and shining a light.
- Stay alert – don’t wear headphones or use your phone while crossing the street or walking across a busy road.
Bicyclists
Bicyclists can help protect themselves by staying alert and visible, especially in areas where traffic, pedestrians and young students may be present.
- When possible, plan your route along bike paths or roads with dedicated bike lanes away from vehicle traffic.
- Equip your bicycle with lights and reflectors to be more visible to drivers and pedestrians.
- Wear a properly fitted helmet and bright clothing.
- Learn cyclist hand signals to communicate when you’re turning, slowing or stopping.
- Stay aware of drivers and always yield to pedestrians.
To learn more and join the movement, visit GoSafelyCA.org.
E-Bike Safety Tips
With more young people using e-bikes than ever before, it’s important that riders and their parents or guardians understand the risks involved and make smart, safe choices.
Since e-bikes can travel at faster speeds than traditional bicycles, they pose greater risk for serious injury or death in the event of a crash. Class 1 and 2 e-bikes can both travel at up to 20 mph unassisted, while Class 3 e-bikes can go as fast as 28 mph unassisted.
E-bike rules vary based on the top unassisted speed, but parents and guardians should follow these tips for e-bikes:
- Many local ordinances and state laws restrict e-bike use for minors or require special licensing.
- Helmets are required for riders under age 18 for Class 1-2 e-bikes and all riders on Class 3 e-bikes, regardless of age.
- You must be 16 years or older to ride a Class 3 e-bike.
- Never ride e-bikes that don’t have pedals as they could be considered e-motos and not legally permitted on roads.
- Ride in bike lanes or on legal paths, avoiding roads with traffic when possible.
- Be as predictable as possible and use caution when making turns, crossing streets or riding in conditions with poor visibility.
E-bike rules may vary by state and regionally. Contact local law enforcement regarding local laws.
SOURCE:
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News
Black Los Angeles Is Shrinking—and Spreading Across the West
Black Los Angeles has changed dramatically over the past several decades. Explore why its population declined, where families moved, and which neighborhoods continue to anchor the region’s Black community.
Last Updated on August 21, 2026 by Daily News Staff
Black Los Angeles?
For much of the 20th century, South Los Angeles was the center of one of the most influential Black communities in the western United States. Neighborhoods such as Watts, West Adams, Crenshaw, Baldwin Hills and Leimert Park produced political leaders, musicians, entrepreneurs and cultural movements whose influence reached far beyond Southern California.
That community has not disappeared, but it has become smaller and considerably more dispersed.
Census figures show that Los Angeles has experienced a sustained decline in its Black population, particularly within the city and the older communities of South Los Angeles.
A decades-long population decline
In 1990, approximately 454,000 Los Angeles residents identified as non-Hispanic Black alone, representing about 13% of the city’s population. By the 2020 Census, that number had fallen to approximately 323,000—or about 8.3% of the population.
The same pattern is visible across Los Angeles County.
The county’s non-Hispanic Black population declined from approximately 935,000 in 1990 to about 761,000 in 2020. Between 2010 and 2020 alone, it fell by nearly 55,000 people, even as the county’s total population increased.
These numbers do not include everyone with partial Black ancestry or those identifying as multiracial. Nevertheless, the figures reveal a clear geographic and demographic shift.
Black Los Angeles has not simply vanished. It has spread outward.
Why have Black families left Los Angeles?
Housing costs are one of the most important factors.
As rents and home prices rose, many working- and middle-class families found it increasingly difficult to remain in neighborhoods where their families had lived for generations. Redevelopment and gentrification placed additional pressure on renters and homeowners, particularly in areas near downtown Los Angeles and new transit investments.
Older homeowners could sometimes benefit from rising property values, but their children often could not afford to purchase homes nearby. Selling a Los Angeles property also gave some families enough equity to buy larger or newer homes elsewhere.
Researchers at UC Berkeley’s Terner Center found that Black households were disproportionately represented among lower-income residents leaving the Los Angeles region.
Employment changes also contributed. Los Angeles lost many of the manufacturing, aerospace and industrial jobs that had helped support Black working-class families during the postwar period. Meanwhile, metropolitan areas in other states offered lower housing costs and growing professional communities.
Where did people go?
A significant portion of the movement remained within Southern California.
Lancaster and Palmdale in the Antelope Valley attracted families from South Los Angeles, Compton and Inglewood. Others moved east into Riverside and San Bernardino counties.
Between 1990 and 2021, Riverside County’s Black population grew from approximately 64,000 to more than 156,000. San Bernardino County’s Black population increased from approximately 115,000 to 174,000 during the same period.
The Urban Institute concluded that many Black residents leaving Los Angeles County likely settled in these neighboring Inland Empire counties.
Other families left California entirely. Las Vegas and Phoenix became important destinations for people seeking comparatively affordable housing while remaining relatively close to Southern California.
Farther away, Atlanta, Dallas–Fort Worth, Houston and Charlotte have attracted Black professionals and families as part of what researchers call the “New Great Migration”—a movement of Black Americans toward metropolitan areas in the South.
Where are the remaining Black population centers?
The strongest concentration within the city continues to run through the Crenshaw district and surrounding neighborhoods.
Leimert Park remains the symbolic and cultural heart of Black Los Angeles. Baldwin Hills, Baldwin Vista, Hyde Park, West Adams and Crenshaw also retain important Black institutions, churches, businesses and homeowners.
Immediately outside the city, View Park–Windsor Hills and Ladera Heights remain two of the county’s most prominent Black middle- and upper-middle-class communities. Recent American Community Survey estimates indicate that approximately 55% of Ladera Heights residents identify as Black.
Inglewood remains another major center of Black cultural and commercial life, despite its transition into a predominantly Latino city. Central and northern Inglewood, particularly areas near Morningside Park, View Park and Hyde Park, retain substantial Black populations.
Farther south, Black communities remain in Westmont, West Athens, Carson, Gardena, North Long Beach and portions of Compton. Most of these places are no longer majority-Black, but they continue to contain significant populations and long-established community institutions.
Lancaster and Palmdale now represent one of the county’s largest suburban concentrations of Black families. Unlike the compact neighborhoods of historic South Los Angeles, however, the Antelope Valley population is distributed across a much larger area.
Altadena was another important center of Black homeownership before the January 2025 Eaton Fire. The community’s Black population had already declined from its 1980 peak, but west Altadena still contained generations of Black homeowners. The fire destroyed or seriously damaged many of those homes, leaving the community’s future uncertain.
A community transformed, not erased
Today’s Black Los Angeles is more fragmented and suburban than the community that existed during the second half of the 20th century.
Leimert Park, Crenshaw and Baldwin Hills remain culturally significant, but they are now part of a much wider network extending from Inglewood and Carson to Lancaster, Palmdale and the Inland Empire.
This transformation presents a challenge for maintaining political representation, neighborhood institutions and cultural connections. A population that once lived within a relatively concentrated area is now spread across multiple cities, counties and states.
The story, therefore, is not simply that Black Los Angeles declined.
It is that rising housing costs, economic changes and suburban migration redrew the map of Black life in Southern California.
Sources: U.S. Census data compiled by Los Angeles Almanac, Urban Institute, UC Berkeley Terner Center and Brookings Institution.
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