Over the last few years,
sustainability has become one of the biggest buzzwords in the fight against environmental problems like climate change, loss of biodiversity, ecosystem degradation, and pollution. But what does sustainability actually mean? And how do you make it part of your everyday life?
Broadly speaking, sustainability is the idea that we must meet our own needs
without compromising the ability of others to meet their needs, whether the “others” in question are future generations or people living in other parts of the world. But understanding the basic concept is one thing. Practicing it is quite another.
Every single day we make dozens of different choices that impact our planet. But understanding this impact is not easy. And when it comes to green living, there is a lot of conflicting information about what’s eco-friendly, what’s not, what’s fact, and what’s fiction.
But green sustainable living is possible. With a little guidance, we can all learn to make better choices for ourselves and the planet.
And that’s where the Sustainable Living Online Course from International Open Academy comes in.
Sustainable Living Online Course

When it comes to green living, there’s certainly no shortage of information available on the internet. The trouble is figuring out who knows what they are talking about and what information is legit.
If you’re tired of spending half of your research time trying to vet your sources and you just want straight answers to your questions about sustainable living, the Sustainable Living Online Course is for you. Sustainability experts designed this course to be the ultimate resource on sustainable living. As such, it covers everything you need to know to lead a renewable life that keeps you and the planet healthy.
Key topics covered in this online course include:
- how to make sustainable living easy
- how to look great without damaging the environment
- how to spot companies that aren’t eco-friendly
- how to save money and the planet at the same time
- how to find sustainable food that tastes great
- how to make simple swaps that make a big impact
Of course, the Sustainable Living Online Course won’t magically reduce your carbon footprint to zero. You’ll still have to put in the work and implement what you learn. But this course will give you the tools you need to be a better citizen and live a healthier, more natural life.
International Open Academy, or IOA, is one of the internet’s most trusted sources for online learning, with over a million students in 139 different countries. Whether you want to learn coding, interior design, or knitting, IOA’s accredited online courses make learning easy, fun, and affordable. No matter the subject, IOA courses focus on practical skills, with videos, texts, activities, and exams that students work through at their own pace.
Normally, the Sustainable Living Online Course costs $119. However, you can enroll through Groupon for just $17, which is a whopping 86 percent off the regular price.
If you’ve made it your goal to be more eco-friendly in 2023 but are unsure where to start, this deal on the Sustainable Living Online Course from International Open Academy is definitely for you. Click here to start your sustainable living journey today.
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A safe, stable home can change lives for the better. Here’s how Habitat for Humanity wants to make that possible for everyone.
Better health, better jobs, and a brighter future all start with access to a safe, affordable home.
A single door can open up a world of endless possibilities. For homeowners, the front door of their house is a gateway to financial stability, job security, and better health. Yet for many, that door remains closed. Due to the rising costs of housing, 1 in 3 people around the world wake up without the security of safe, affordable housing.
Since 1976, Habitat for Humanity has made it their mission to unlock and open the door to opportunity for families everywhere, and their efforts have paid off in a big way. Through their work over the past 50 years, more than 65 million people have gained access to new or improved housing, and the movement continues to gain momentum. Since 2011 alone, Habitat for Humanity has expanded access to affordable housing by a hundredfold.
A world where everyone has access to a decent home is becoming a reality, but there’s still much to do. As they celebrate 50 years of building, Habitat for Humanity is inviting people of all backgrounds and talents to be part of what comes next through Let’s Open the Door, a global campaign that builds on this momentum and encourages people everywhere to help expand access to safe, affordable housing for those who need it most. Here’s how the foundation to a better world starts with housing, and how everyone can pitch in to make it happen.

Volunteers raise a wall for the framework of a new home during the first day of building at Habitat for Humanity’s 2025 Carter Work Project. Globally, almost 3 billion people, including 1 in 6 U.S. families, struggle with high costs and other challenges related to housing. A crisis in itself, this also creates larger problems that affect families and communities in unexpected ways. People who lack affordable, stable housing are also more likely to experience financial hardship in other areas of their lives, since a larger share of their income often goes toward rent, utilities, and frequent moves. They are also more likely to experience health problems due to chronic stress or environmental factors, such as mold. Housing insecurity also goes hand-in-hand with unstable employment, since people may need to move further from their jobs or switch jobs altogether to offset the cost of housing.
Affordable homeownership creates a stable foundation for families to thrive, reducing stress and increasing the likelihood for good health and stable employment. Habitat for Humanity builds and repairs homes with individual families, but it also strengthens entire communities as well. The MicroBuild® Initiative, for example, strengthens communities by increasing access to loans for low-income families seeking to build or repair their homes. Habitat ReStore locations provide affordable appliances and building materials to local communities, in addition to creating job and volunteer opportunities that support neighborhood growth.

Marsha and her son pose for a photo while building their future home with Southern Crescent Habitat for Humanity in Georgia. Everyone can play a part in the fight for housing equity and the pursuit of a better world. Over the past 50 years, Habitat for Humanity has become a leader in global housing thanks to an engaged network of volunteers—but you don’t need to be skilled with a hammer to make a meaningful impact. Building an equitable future means calling on a wide range of people and talents.
Here’s how you can get involved in the global housing movement:- Speaking up on social media about the growing housing crisis
- Volunteering on a Habitat for Humanity build in your local community
- Travel and build with Habitat in the U.S. or in one of 60+ countries where we work around the globe
- Join the Let’s Open the Door movement and, when you donate, you can create your own personalized door
- Shop or donate at your local Habitat ReStore
Every action, big and small, drives a global movement toward a better future. A safe home unlocks opportunity for families and communities alike, but it’s volunteers and other supporters, working together with a shared vision, who can open the door for everyone.
Visit habitat.org/open-door to learn more and get involved today.
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Humans used to have a ‘first sleep’ and ‘second sleep’ at night. Here’s why that changed.
People relished having an extra two hours in the middle of the night to do chores, pray, or hang out with their loved ones.
One of the unquestioned pieces of health advice we’ve heard for decades is to get eight hours of sleep every night, with the assumption that it should be as close to consecutive as possible. However, a fascinating discovery by historian Roger Ekirch in the early 1990s found that, as far back as recorded history and up until the Industrial Revolution, human beings slept in two distinct phases every night: “first sleep” and “second sleep.”
The wild thing about Ekirch’s study was that the evidence of biphasic sleep was staring us in the face the whole time; we just turned and looked the other way. Ekirch was researching a book on human nighttime behavior when he came across a 1697 legal document in a London record office. In a deposition by a nine-year-old girl, she revealed that her mother left the house after “first sleep” and was later found dead.

A woman sleeping. Photo credit: Canva The first glimpse at “first sleep”
“I had never heard the expression, and it was expressed in such a way that it seemed perfectly normal,” Ekirch told CNN. “I then began to come across subsequent references in these legal depositions, but also in other sources.”
Further research revealed that first and second sleep routines date back as far as the 8th century B.C.E.
Historically, humans flopped onto their beds sometime between 9 p.m. and 11 p.m. and slept until around 1 a.m., followed by a period of wakefulness known as “the watch,” which was an incredibly productive time.
“[The records] describe how people did just about anything and everything after they awakened from their first sleep,” Ekirch told the BBC.
What you did during the watch depended a lot on your social status. Peasants would take the time to tend to their livestock or perform domestic chores. Religious people took the time to pray and practice their faith, as they would face fewer distractions than during daylight hours. The watch was also a great time for people to relax and talk to one another; for couples, it was the perfect time for intimacy.
Two sleeps a night is completely natural
A 1992 study by Thomas Wehr from the National Institute of Mental Health took a group of volunteers and removed all natural light from their lives so they could live like humans before the discovery of fire. Within weeks, every participant settled into a biphasic sleep pattern. Wehr measured their hormones during the wakeful period in the night and found that the participants produced elevated levels of prolactin, the same hormone released during meditation and after orgasm. This wakeful period wasn’t just a change in their sleep-wake cycle, but it was another state of consciousness altogether.
Why did human sleep patterns change?
So what happened? How did we switch from centuries of biphasic sleeping to sleeping in one long, uninterrupted chunk (unless, of course, you have insomnia)? One reason was that in major cities of the industrialized world, street lamps and other lights began to be installed in the 1700s to improve public safety, encouraging people to stay out later at night.

Lanterns on the forecourt of a pier at sunset in Germany. Photo credit: Dietmar Rabich/Wikimedia Commons The Industrial Revolution also brought about changes in modern work schedules.
“The answer is really to follow the money,” Ben Reiss, author of Wild Nights: How Taming Sleep Created Our Restless World, told CNN. “Changes in economic organization, when it became more efficient to routinize work and have large numbers of people showing up on factory floors, at the same time and doing as much work in as concentrated fashion as possible.”
The invention of the alarm clock in 1787 also had a big effect on the average worker’s sleep schedule.
Ultimately, the history of biphasic sleep shows how much of humanity’s natural patterns have been disrupted by modern technology. One wonders what would happen to our collective mental and physical health if we returned to the way we slept before the Industrial Revolution.
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Why do breakups hurt so much? Researcher put people in MRI scanners to find out. Her answer explains everything.
“Romantic love is an addiction — a perfectly wonderful addiction when it’s going well, and a perfectly horrible addiction when it’s going badly.”
Helen Fisher spent decades asking a question most scientists avoided: what is love, exactly, and what is it doing to your brain? By the time she died in August 2024 at 79, she had an answer, and it turns out heartbreak makes a lot more sense once you understand it.
Fisher was a biological anthropologist and senior research fellow at the Kinsey Institute, best known for pioneering the use of brain imaging to study romantic love. She noted early in her research that love appears in every human society ever studied, and across 170 cultures, there is no example of a society without it. What varies is the expression. What doesn’t vary is the experience.
To understand what love actually does to the brain, Fisher and her colleagues scanned 17 people who described themselves as newly and madly in love. When shown photographs of their partners, a specific region deep at the base of the brain lit up: the ventral tegmental area, or VTA. This is the area that produces dopamine, the neurotransmitter associated with wanting, motivation, focus, and craving. It is, Fisher noted, the same region that activates during the rush from cocaine.
Romantic love, she concluded, is not an emotion. It is a drive — a chemical push toward another person that functions like an addiction when it’s working, and like withdrawal when it isn’t.
Then she scanned the people who had been dumped.
All 15 showed activity in the same VTA. The drive, the craving, the wanting was all still there. But two additional regions also lit up. One was associated with calculating gains and losses, the part of the brain that runs obsessive post-mortems, asking what went wrong and whether it could be fixed. The other was associated with deep attachment. In the recently published obituary in The Telegraph, Fisher’s research was described as showing activity also in areas linked to physical pain, risk-taking, obsessive-compulsive behavior, and anger. All of this, running simultaneously, in someone who just wants to stop thinking about a person they no longer have.
“Romantic love is an addiction,” Fisher said. “A perfectly wonderful addiction when it’s going well, and a perfectly horrible addiction when it’s going badly.”
One person who found Fisher’s framing genuinely useful was Dessa, a Minneapolis-based rapper. She had tried and failed to get over an ex-boyfriend and was frustrated by her own inability to move on despite wanting to. “It really bothered me that, no matter how much effort I tried to expend in trying to solve this problem, I was stuck,” she told NPR. Fisher’s explanation of the VTA gave her a new angle. “That you could objectively measure and observe ‘love,’ that had never occurred to me before.”
Dessa went on to try neurofeedback, a technique in which participants learn to consciously alter their own brain wave activity. A study published in Neuron found that participants trained to modulate their VTA activity were eventually able to do so without any external stimulus, effectively learning to turn down the volume on the craving.
It isn’t a cure. Fisher was careful about what she claimed. But understanding that the pain of heartbreak is neurologically structured, that it has a physical location in the brain and follows identifiable patterns, at least makes it feel less like a personal failing and more like a process that, with time, tends to resolve.
Fisher finished the manuscript for her final book five days before she died.
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Expert shares the ‘5 communication types’ and how understanding them can make relationships easier
Are you a peacemaker, an advocate, harbor, thinker, or a spark?
Having a healthy communication style isn’t just about how you speak. It’s how you listen and perceive the other person or people to whom you’re talking. Knowing the strengths (and sometimes more importantly, the weaknesses) they might bring to a conversation can often help produce a better outcome.
Licensed therapist Jason VanRuler developed an efficient quiz to help people determine their communication style. After answering a short series of questions, an individual can find out if they lean toward the “peacemaker, the advocate, the harbor, the thinker, or the spark.” Of course, most of us don’t fit neatly into one box or another. To account for that, each archetype (to borrow Carl Jung’s term) is given a number, so one can see how they relate to each style.
Reading the room
In an Instagram Reel posted by VanRuler, he explains how essential mere perception can be. “You may think great communication is about saying the right thing, but it’s actually about knowing how to read the room. When something doesn’t land, we often blame the other person for not understanding, instead of asking how our message may not have connected with them. Different people process information differently, and ignoring that creates disconnect.”
How to reframe
There are ways in which he says a person can reframe. “What to Do About It: Shift your focus from ‘Why didn’t they get it?’ to ‘How can I say this in a way that connects with them?’ Pay attention to how people respond and adjust your approach accordingly. Great communicators don’t just express well, they adapt well.”
In the clip, he describes a time when he was giving a conference to a room full of accountants. “So I got up and I talked a lot about feelings, and I went really deep and got really emotional. And it was really, really quiet. And I left thinking, ‘what was wrong with the audience? Why didn’t they resonate with what I just said?’ But what I didn’t really think about is, what is it about what I just said that didn’t resonate with them?”
Learning your “style” can help facilitate better relationships through stronger communication. On VanRuler’s website, he explains who he’s attempting to help, writing, “Whether it’s leadership coaching, relationship building, couples therapy, addiction, trauma, or something different, my goal is the same: to speak truth and grace into every life I work with.”
The 5 types
In a press piece for his new book Discovering Your Communication Type: The 5 Paths to Deeper Connections and Stronger Relationships, VanRuler gives a quick explanation of the strengths of each type. (He refers to what we might call “weaknesses” as “opportunity.” The idea being to ask one’s self, “what opportunity do I have to strengthen my communication style?’
Peacemaker
“Strength: Creates peace and eases tension in difficult or trying moments.
Opportunity: Can avoid necessary conflict, which delays resolution and repair.”Advocate
“Strength: Focused on justice, fairness, and upholding morals; advocates for their beliefs.
Opportunity: Can present as intense or overpowering, or advocate when it’s not needed.”Thinker
“Strength: Focused on logic, thoughts, facts, and getting things correct.
Opportunity: Can miss cues for feelings and appear distant or emotionally unavailable.”Harbor
“Strength: Creates a safe space for others to go deep and talk about feelings and emotions.
Opportunity: May struggle to express their own needs, communicate boundaries, or be the focal point of a conversation.”Spark
“Strength: Brings lots of energy, creativity, and momentum to conversations.
Opportunity: Can struggle with consistency and initiating difficult conversations.”He makes it clear that understanding these “paths” is a great start to elevating a relationship, saying, “Each path speaks a different ‘language,’ and the more fluent you become in other styles, the better you can bridge the gap between you and the people you care about.”
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A 21-year-old kept her symptoms secret out of embarrassment and it led to a life-changing diagnosis
“I think I would have gone a little longer without losing my bowel had I gone to the doctor earlier.”
Alex Lyons is on a mission to make sure no one else suffers in silence. The 21-year-old from Armagh, Northern Ireland, spent months hiding a secret that she feared was too “gross” or “humiliating” to share with her friends and family. But as the BBC reported, that silence nearly cost her everything.
The health costs of staying silent with IBD
Lyons first noticed she was having frequent, urgent bowel movements and spotted blood in her stool. Instead of seeking help, she ignored the signs, hoping they would simply go away. Her hesitation was rooted in a deep sense of embarrassment and a desire to protect her family. Her twin brother, Joe, had recently undergone bowel removal surgery due to a chronic condition, and Alex didn’t want to put her parents through that trauma a second time.
Unfortunately, the symptoms of inflammatory bowel disease (IBD) do not wait for a convenient time to be addressed. By the time Alex finally disclosed her struggle, her condition had progressed to a life-threatening level. She was diagnosed with ulcerative colitis, a form of IBD that causes chronic inflammation and ulcers in the lining of the colon. According to the Cleveland Clinic, these symptoms are often caused by an overactive immune response, and as seen in the case of Alex and her brother, genetic factors often play a significant role.
The inflammation was so aggressive that standard treatments could no longer save her bowel. She was rushed into emergency surgery, a procedure that saved her life but changed it forever. “I think I would have gone a little longer without losing my bowel had I gone to the doctor earlier,” Alex told the BBC.
From ambulance to advocacy
Now, Alex is using her voice to dismantle the stigma that kept her silent. She has become a viral advocate on TikTok, documenting her life with a stoma bag and showing her followers that a medical diagnosis doesn’t mean the end of a vibrant life. She refuses to let her condition stop her from wearing her favorite clothes or going out with friends.
Speaking out about Ulcerative Colitis
The lesson Alex wants to share is simple but vital: speaking up sooner matters more than avoiding a few minutes of discomfort. What might seem like a minor, embarrassing issue can develop into a serious health crisis if left unaddressed. As Alex and her brother continue their healing journey together, they are proving that there is no room for shame when it comes to saving your own life.
Follow Alex Lyons (@alex.lyonss) on TikTok for more content on health and lifestyle.
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Why don’t space photos ever show stars? NASA’s explanation is simpler than you’d think and a photo from Artemis II proves it.
It comes down to basic camera science. The same rules that apply to your phone apply to cameras 400,000 kilometers from Earth.
Every time NASA releases a stunning image from space of something like the Earth glowing against blackness, or the Moon’s cratered surface in sharp detail, the same question follows: where are the stars?
It happened again when NASA’s Artemis II crew, which launched April 1, 2026 and flew around the Moon before splashing down in the Pacific on April 10, began beaming back photos from their historic 10-day mission. The images were breathtaking. The backgrounds were pitch black. And the conspiracy theories started almost immediately.
The camera can only do so much
NASA’s answer, as explained in an Instagram post, is straightforward: it’s just how cameras work.
A camera captures a limited range between the brightest and darkest parts of a scene. When you’re photographing the Moon or the Earth from space, you’re dealing with an enormous difference in brightness. The sunlit surface of the Moon is extraordinarily bright, while stars are extraordinarily dim. To expose correctly for the bright object in the foreground, the camera’s settings have to be adjusted in a way that makes the faint stars in the background vanish into black.
Three settings control this. Shutter speed determines how long the camera’s sensor is exposed to light. ISO controls how sensitive that sensor is to light. And aperture determines how wide the lens opens. Getting the Moon in sharp, detailed focus means tuning all three for brightness, which is the opposite of what you’d need to pick up the faint glow of distant stars. You could technically try to capture both, but the result would be a blurry, overexposed mess where neither looks right.
The same thing happens on Earth. Try taking a photo of the night sky next to a bright streetlight. The stars disappear. The light itself isn’t unusual. It’s physics.
The photo that proves both sides
The most remarkable image from the Artemis II mission accidentally became the perfect illustration of exactly this phenomenon. On April 6, during their seven-hour flyby of the Moon’s far side, the crew captured a total solar eclipse. The Moon completely blocked the Sun for nearly 54 minutes of totality, far longer than any eclipse visible from Earth’s surface.
In that image, stars are clearly visible. Dozens of them, scattered across the frame around the dark disk of the Moon with its glowing halo of light. Venus appears as a bright silver glint on the edge. It’s one of the most striking photographs ever taken by humans in deep space.
The reason the stars appear is the same reason they normally don’t: the object in the foreground is dark. With the Moon blocking the Sun, there’s no blinding bright surface to expose for. The camera settings could be adjusted to capture the dim light of distant stars, and they showed up exactly as they should.
As NASA noted in the image description, stars are “typically too faint to see when imaging the Moon, but with the Moon in darkness stars are readily imaged.”
A historic mission
The Artemis II mission marked humanity’s return to the Moon’s vicinity for the first time since Apollo 17 in 1972. The crew included commander Reid Wiseman, pilot Victor Glover, and mission specialists Christina Koch and Jeremy Hansen of the Canadian Space Agency. They set multiple records. Koch became the first woman to travel beyond low Earth orbit. Glover became the first person of color to witness the lunar far side. Hansen became the first person from a nation other than the United States to go to the Moon. And the mission broke the all-time crewed distance record, reaching 406,771 kilometers from Earth, surpassing the mark set by Apollo 13 in 1970.
The crew also captured an Earthset, with Earth sinking below the Moon’s horizon, that deliberately echoed the iconic Earthrise photo from Apollo 8 in 1968. They photographed ancient lava flows, impact craters, and surface fractures on the far side. They witnessed six meteoroid impact flashes on the darkened lunar surface.
Koch described the experience with characteristic simplicity: “The Moon really is its own unique body in the Universe. It’s not just a poster in the sky that goes by. It’s a real place.”
And it turns out space is full of stars. You just need the right conditions and the right camera settings to see them.
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His mysterious toe pain lasted five years. The scan that finally caught it gave him four days to live.
“If my whole leg hadn’t swollen up, I would have dropped dead.”
Richard Bernstein walked around barefoot a lot at home, so when his right toe started hurting in 2017, he assumed he’d stubbed it. A visit to his podiatrist confirmed nothing was broken and nothing was wrong. He moved on.
But the pain didn’t.
Five years of pain that no one could explain
Over the next few years it crept upward from his toe to his ankle, then to his knee. A sports medicine doctor suggested stenosis and recommended physical therapy. That didn’t help either. Walking became gradually harder. On a trip to Greece, Bernstein had to sit out while his friends climbed to hilltop monasteries. He took his dog to the park less and less.
In March 2022, his right leg swelled noticeably. His doctor ordered an abdominal scan. What it found changed everything.
What they found when they finally looked
Bernstein had a massive cancerous kidney tumor that had grown into his vena cava, the main vein that returns blood from the lower body to the heart. The tumor and tumor thrombus were a foot long and weighed around two and a half pounds. Because the vena cava was almost completely blocked, blood was backing up in his lower extremities, which explained the years of unexplained pain creeping up his right side. His two main coronary arteries had also been compromised, with 99 percent of their function lost.
He was referred to Dr. Michael Grasso, chair of urology at Phelps Hospital. Grasso’s assessment was direct. “He told me I had four days to live,” Bernstein said.
A 12-hour surgery, three specialists, one chance
The surgery required three specialists working simultaneously over 12 hours at Lenox Hill Hospital in New York City. Dr. Grasso handled the kidney and tumor removal. Cardiothoracic surgeon Dr. Jonathan Hemli performed a double bypass on the coronary arteries, which had been discovered only once Bernstein was already admitted, an unexpected complication that Hemli said they couldn’t ignore. “It would have been really disappointing to cure him of his kidney cancer only to learn in six months, nine months, a year that the poor man had a heart attack and didn’t survive,” Hemli told TODAY. Vascular surgeon Dr. Alfio Carroccio opened the vena cava to remove the tumor thrombus, which extended all the way into the heart.
To do the work safely, the team had to cool Bernstein’s body, stop his heart, and run him on a heart-lung bypass machine while they operated. Then they slowly warmed him back up and restarted his heart.
Bernstein spent three days sedated afterward, a week in intensive care, and nearly three weeks in cardiac rehab relearning to walk. He lost around 30 pounds. He gained it back.
He’s now on ongoing immunotherapy and doing twice-yearly scans. Dr. Grasso’s update: “The cancer hasn’t spread anywhere else, which is amazing, considering where he came from.”
Bernstein’s own assessment of how he got through it: “My attitude is ‘it is what it is, and there’s not much we can do about it.’ That got me through.” His advice for anyone else in a similar situation: “If something is wrong and they can’t find it, don’t give up looking. Trust your feelings about your own body.”
And on the swollen leg that finally triggered the scan that saved him: “If my whole leg hadn’t swollen up, I would have dropped dead.”













