BY THE OPTIMIST DAILY EDITORIAL TEAM Street trees reduce urban heat. That much is established. What’s less settled is whether they’re enough on their own, or whether the way a city plants matters as much as how much it plants. New field research from Melbourne, Munich, and Hong Kong, led by Mohammad A. Rahman at the University of Melbourne, suggests the latter. In some conditions, layered planting outperforms trees alone considerably. In others, adding more vegetation makes streets worse. The numbers The Melbourne figure is the one that stands out. Street trees reduced mean radiant temperature by more than 18 degrees Celsius (32 degrees Fahrenheit) compared with open, unplanted streets. Mean radiant temperature is the heat coming at a person from surrounding surfaces, roads, walls, nearby buildings, rather than from the air itself. Air temperature barely shifted. Radiant heat dropped hard. Munich showed the strongest case for layered planting specifically. Streets with trees, shrubs, and ground cover together cut afternoon heat stress by nearly eight degrees Celsius (14 degrees Fahrenheit) against open spaces, a bigger drop than trees alone produced. Hong Kong also benefited from vegetation, mainly through dense canopy shade. But the results were messier. When more planting makes things worse Dense planting in Hong Kong raised humidity enough to cancel some of the cooling it created. Transpiration helps in dry climates. In a humid subtropical city, it tips the balance: the air gets stickier, sweat evaporates more slowly, and people end up less comfortable even if temperatures technically fall. In narrow Munich streets, dense vegetation cuts airflow, trapping warm air and keeping vehicle pollution from dispersing. “Climate, street width and airflow all shape whether vegetation improves comfort or creates unintended side effects,” the researchers write. Canopy coverage targets developed for one city’s conditions don’t reliably apply elsewhere. What this changes about how cities should plant The study’s argument is fairly direct: tree counts are the wrong metric. Coverage matters, but arrangement and plant type matter just as much. In parks and large open spaces, layered vegetation works best and supports biodiversity alongside cooling. In narrow urban streets, shade has to be weighed against airflow, or the planting creates new discomfort while addressing old heat. Planting more is not the same as planting well. For cities putting significant money into heat adaptation, that distinction is worth building into the planning stage rather than discovering after the fact. Source study: Nature in Cities, Nurturing Cities—The microclimate and human thermal comfort impacts of increased vegetation complexity in urban streets and greenspaces     Did this solution stand out? Share it with a friend or support our mission by becoming an Emissary.The post The urban cooling gap: why planting design matters as much as canopy count first appeared on The Optimist Daily: Making Solutions the News.

BY THE OPTIMIST DAILY EDITORIAL TEAM In 2014, researchers placed exercise wheels in two natural outdoor settings and left them there. Wild mice found the wheels and ran on them, sometimes for up to 18 minutes at a stretch, with no training and no food reward. The running continued long after all the bait was removed. For decades, scientists had assumed wheel running was a neurotic artifact of captivity. Rodents are built to cover ground Researcher Johanna Meijer and her colleagues monitored activity at both locations, a green urban area and a remote dune site inaccessible to the public, for more than three years. The wheels drew more than just mice. Shrews, frogs, and slugs also climbed on (a small number of snails were excluded from the data due to erratic movement patterns). Mice still dominated, accounting for 88 percent of all recorded wheel-running activity. Dr. Theodore Garland Jr., a professor of biology at UC Riverside who has studied wheel-running behavior for more than 30 years, points to physiology as part of the explanation. Rodents have the aerobic capacity, metabolic rate, and home-range size to keep going in ways most other animals simply can’t. “A toad isn’t going to be running 10 kilometers in a day,” Garland says (roughly six miles). “Whereas a chipmunk could be.” But that explains the capacity. Not the drive. Dopamine is the likely driver Why would any wild animal choose repetitive wheel running? Wild ones have plenty else to do. “There’s still a lot of controversy about what, exactly, wheel running means to an organism,” Garland says. “What is it? What is the organism trying to do?” The leading hypothesis involves the brain’s reward system. “Dopamine is viewed as the final common denominator,” Garland says. Much like finishing a workout, rodents appear to get a neurochemical payoff from running. In Garland’s lab, mice placed in oversized wheels have been seen slowing mid-run, riding the wheel through a full 360-degree rotation, then carrying on. No obvious purpose. It looks like acrobatics for the fun of it. “I’m hesitant to use the ‘F-word’ about lower vertebrates,” Garland says referring to the word fun, “but it’s hard to ignore the idea that they’re getting some sort of pleasure or enjoyment out of it.” This might be the same thing behind the zoomies in dogs, or a young horse tearing around a pasture for no apparent reason. Garland calls it “nip-norting”: burning energy in unprompted bursts, seemingly just because it feels good. Early access may shape lifelong behavior Garland’s research also points to a developmental window that matters. Mice given access to wheels right after weaning, at just three weeks old, ran significantly more as adults than those introduced to the equipment later. “It’s got to be something up here,” Garland says, pointing to his head. “Their reward system has been permanently tweaked.” He thinks the same logic applies to people. Kids who never get regular movement practice may not develop the circuitry that makes exercise feel rewarding. “If you’re a kid who never gets to play basketball or tennis,” Garland says, “and then you get to college, and your friends are playing pickup games, it’s probably not even on your radar to do that kind of thing.” Cutting PE from school schedules, he argues, could leave a mark that shows up decades later. The wheel-running research points to something beyond rodent biology. Wild mice sought out the wheels and kept running with no training, no reward, and no one watching. The will was already there. If the same is true for humans, and if the developmental window matters as much as the mouse data suggests, the policy question changes shape. It is not primarily about motivating adults to exercise. It is about whether children are getting the conditions to build the wiring before it is set.     Did this solution stand out? Share it with a friend or support our mission by becoming an Emissary.The post Why hamsters run on wheels, according to 30 years of research first appeared on The Optimist Daily: Making Solutions the News.

William Hines is five years old, lives in Arvada, Colorado, and is pretty sure he’s going to be a pilot. Based on his attention to detail, the airlines might want to get in line early. Hines’ love of aviation started absurdly early. His mother, Amber Hines, said that even during “tummy time” as a baby, he was studying how wheels moved and taking apart toy cars to figure out how they worked, reported KGNS News. As he got older, the family made regular trips to Rocky Mountain Metro Airport so he could watch planes take off and land. An obsession or a calling? His obsession went to another level when Amber connected with a staff member at her daughter’s school whose spouse was a commercial pilot. That pilot, named Josh, showed up at Hines’ house in full uniform and spent two hours going over aeronautical charts and talking through the details of commercial flying. As a parting gift, Josh handed Hines a Southwest company training manual, the comprehensive guide pilots use to learn aircraft systems, safety procedures, and operational protocols. William started flipping through it. Within minutes, he found something. “I discovered that two terrain monitors did not match. They did not match at all. One side’s farther and one side’s closer,” William said. His mom explained what he’d caught. “One was very, very zoomed out, while the other one was zoomed in. He was able to identify the fact that these should look the same, but they looked different because one was drastically zoomed out from the other one.” To be clear, Southwest later looked into it and clarified that there wasn’t an actual error in the manual. The two terrain displays simply showed different zoom levels, and Amber confirmed it “wasn’t an error, just that the child’s eagle-eyed attention to detail caught two terrain gauges in the training manual that didn’t match.” But that’s almost beside the point. A newly minted five-year-old looked at a dense, technical document full of cockpit instrumentation and immediately noticed that two diagrams weren’t consistent with each other. Most adults would have flipped right past it. View this post on Instagram A special VIP tour A family friend who worked for Southwest passed the story up the chain, and it eventually reached Southwest CEO Bob Jordan. The airline was impressed enough to invite Hines and his family to its Dallas headquarters for a full VIP tour of the pilot training facility. Hines got to meet team members, including a simulator pilot named Chris and a staffer named Earl. The highlight, predictably, was getting to sit inside a full-motion flight simulator, the kind real pilots train on. The family says it’s a memory they’ll never forget. When asked why he wants to be a pilot, Hines gave an answer more thoughtful than most adults could manage about their own career goals. He wants to “transport people to a place and not just myself, like 140 people to a place.” He also offered the simplest possible case for aviation: “I love flying. Airplanes get you from place to place a lot faster than a car does. I don’t have to walk 7,000 miles.” Amber summed up her son pretty well, saying, “What 5-year-old knows that? But I also know that he’s a details guy, and he notices things. He listens to everything, and he really absorbs information.” He’s all set The Internet, as usual, had jokes. “Buddy is going to have airlines sending headhunters for him when he gets out of flight school,” one commenter wrote. Another added, “This is what they mean when it says 10+ years of experience.” The post A pilot gave this 5-year-old a training manual. Minutes later he spotted something adults miss. appeared first on Upworthy.

The last day of school is always the sweet start of summer and freedom for both students and teachers. One Oklahoma teacher makes sure to send her students off knowing they are loved. Former second grade teacher Melody Munch (who transitioned to full time classroom resource creation in 2023), shared the touching tribute she did at the end of each school year for her class that she helps current teachers mimic today. Each year, Munch hosted an annual “End of Year Awards.” She presented each student with a personalized award to recognize their skills and gifts, complete with a red carpet (made from butcher paper), music, funky disco lights, and more. Munch also sent them each home with a gift bag. View this post on Instagram “I started the Class Awards tradition during my first year of teaching back in 2015. I wanted to end the year in a warm, special way that made each student feel seen and loved,” she tells Upworthy. “The awards were the perfect parting sentiment to celebrate student’s unique gifts. It also made for a fun way to end the last day of school and sent every student out of my classroom with their head held high. Now it’s my joy to share about this tradition and see other teachers around the world put it to use in their own classrooms!” Besides their awards, Munch also sent each student home with a gift bag full of treats. Inside, there was a photo of each student with Mrs. Munch with a personalized farewell letter, a pair of sunglasses, a custom bookmark, and a postcard they can send to tell her about their summer. “So many families tell me their child cherishes this for years to come! ” she shared. The “End of Year Awards” explained Munch went all out for the awards show. She sets up a red carpet, lighting, music and a projector screen to make the awards feel special. And of course, there was a special microphone. She notes that she let students vote for their classmates on various categories, and also made selections herself. There are over 60 awards that students can get. View this post on Instagram Awards include: Excellent Encourager, Future Teacher, Remarkable Reader, Most Friendly, Fantastic Friend, Sweet As Pie, Aspiring Author, Animal Lover, Best Dressed, Hard Worker, Clean Up Super Star, Problem Solver, Generous Giver, Caring Classmate, Ms. & Mr. Manners, and more. Then, Munch would hand students the printed out certificates, awarding them with two to four each. Their name would be displayed on the projector screen, and they’d get to strut on the red carpet to be recognized by their classmates. She would typically hold the awards on the very last day of school, with some exceptions. View this post on Instagram “My sentimental heart loves the closure and celebratory feel this brings,” she wrote on her website. “However, I have had years where multiple students were scheduled to be gone on early vacations on the last day. Thus, in some cases we did our awards on the second to last day of school.” Making students feel seen Mrs. Munch explained how much the awards impacted her students. “I love this tradition so much! It’s the perfect way to close out the year,” she wrote on Instagram. “It’s so sweet to send students off knowing they are seen and loved. It makes for a great keepsake as well!” She continued, “Students LOVE being called up for their awards. You celebrate each of them for their unique gifts.” “Ending the year is such a bittersweet time. You’ve formed these special bonds with each student, but now it’s time for them to move on. You grieve not getting to be ‘their teacher’ anymore, but you’re also excited for the rest summer brings and the fresh start of the next school year,” she tells Upworthy. “You hope that all the love you’ve poured out over the year will stick with these students wherever they go. Giving each of them an award is just a little way for them to look back and remember how loved they are.” The post Oklahoma second-grade teacher’s annual ‘awards show’ on last day of school leaves students treasured appeared first on Upworthy.

One day in May of 2026, Peter Clist’s doorbell rang at his home in Petersfield, England. A man Clist had never met handed him a piece of mail and said, “I’ve got a postcard for you.” Clist only got the man’s first name (Hugh) before he left. The postcard was from the Galapagos Islands, and the writing on it was in Spanish. Though the card bore his address, it didn’t appear to be addressed to him. It appeared to be intended for “Sheila in Mr. Clists’s PM class.” However, Clist, who teaches morning and afternoon Spanish classes, doesn’t have a student named Sheila in his afternoon class. The mystery of the sender, deliverer, and intended recipient was posted in the local newspaper. Within a week, it was mostly solved. The sender was Sheila, a former student of Clist’s. She had sent it to her former class while visiting the Galapagos. Coastline in the Galapagos Islands (Photo Credit: Canva) But who was Hugh, the man who brought the postcard to Clist’s door? The Galapagos Islands’ 233-year-old makeshift postal service For over 200 years, there have been countless mystery “Hughs” delivering postcards from the Galapagos Islands by hand. The Galapagos has no post office and no postal service. Instead, it has an old wooden barrel on the island of Floreana. Travelers leave mail in the barrel in the hopes someone will eventually take it where it’s supposed to go. No stamps. No postal workers. Definitely no expected time frame. Other tourists simply look through the mail to see if any it is addressed to places near where they live or will be traveling. Then they take it home with them for hand delivery. That wooden barrel sits on Floreana Island at a spot known as “Post Office Bay,” which looks like this: Photo credit: Photo Credit: Canva – Post Office Bay in the Galapagos Island is perhaps the world's most unique "post office." The historic tradition of the Galapagos Islands’ makeshift mail service The barrel currently used is not the original, as ocean elements would have rendered it useless long ago. But the concept of how the “post office” works remains essentially unchanged since whaling ships frequented the islands in the 18th century. Sailors who came through Floreana would leave mail in the barrel to be picked up by other seamen. Anyone who stopped there would sift through the pile to see if any were addressed to a stop on their upcoming itinerary. Rather than an official postal service, the system relied on ordinary people transporting messages wherever they were supposed to go. It’s the same today. Visitors to the island look through the mail in the barrel to see if any is addressed to where they’re going. And it’s quite inspiring to see the lengths some people have gone to to hand-deliver a postcard from a remote island thousands of miles away. Post Office Bay has sometimes looked like this, with driftwood-painted notes left behind. (Photo credit: Professor X/Wikimedia Commons) Some travelers have dedicated years to distributing mail from the Galapagos Some globetrotters have taken the Galapagos mail distribution system to heart and made it part of their travels around the world. One man was touched by the idea of Post Office Bay during a trip to the Galapagos in 2023. He returned the following year, picked up 55 letters and postcards from a wide geographic area, determined to make sure they reached their intended recipients. And he did it in as pure a way as he could. “I avoided using social media to get in touch with people, going purely by address,” he wrote in The Guardian. “If they weren’t there, I’d ask around locally, then use social media, doing my best to hand-deliver the letter. Sometimes, friends who had joined me for part of the trip could help translate, but I had to rely on Google Translate a lot. Usually, people were initially confused, but that would turn to complete joy as they read their letter.” Sometimes postcard delivery leads to beautiful personal connections A woman who loved to travel with her husband did something similar in 2011. The couple scooped up 22 postcards from the barrel to deliver around the world. She shared the story of a particularly sweet encounter they had a few years later on the BBC: “Halfway through our stack of postcards, we found ourselves in Iceland. We had just revealed the missive when tears started forming in our new friend’s eyes. My husband and I shared an uneasy glance, as we weren’t sure what her next reaction would be. Her tears quickly turned to stifled laughter. Half sobbing, half smiling, she explained that she had written the postcard to herself and our lack of comprehension of the Icelandic language resulted in us missing a key element scribbled on the top right-hand side of the postcard: that it should be left in the barrel until she could return to get it. However, she then told us that her life had drastically changed from when she was there last, and the delivery of her postcard could not have come at a better time, since it was unlikely that she’d ever return to the Galapagos. Her self-written postcard reminded her of how far she’d come since her visit four years prior, and of all of the positive changes that had occurred. We spent more than an hour in the tiny cafe, lingering over our lukewarm lattes as we bonded over our shared love of adventure, the story of the post barrel and the future.“ How lovely to know this fun tradition is still connecting people around the world after 233 years. Here’s to the Hughs of the world who go out of their way to keep it going. The post U.K. man got a hand-delivered, mystery postcard from the Galapagos. It has a 233-yr-old history behind it. appeared first on Upworthy.