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  • The Science Fair Project That Turned Into a $12,500 Earth Prize Win

    The Science Fair Project That Turned Into a $12,500 Earth Prize Win

    Many science fair projects solve a small problem and stop there, but Arya Satheesh’s science fair project didn’t. The 18-year-old from Letterkenny built a smart water monitor for a school STEM competition, and hit a dead end. That dead end became Eco Purge, a biodegradable plastic that helped her become the European Regional Winner of the Earth Prize 2026, which Smithsonian magazine and the prize’s own organisers both describe as the largest environmental competition in the world for young people, drawing over 6,000 applications this year.

    There’s a genuinely useful lesson in how she got there, and it’s worth more to students and teachers than the headline ‘teenager invents plastic-eating plastic’ ever will be.

    From a Limited First Project to a Regional Win

    Satheesh’s first project, entered into SciFest, Ireland’s largest second-level STEM fair programme, wasn’t about plastic at all. It was a water monitor designed to detect contaminants in drinking water. It worked, picking up microplastics in real water samples. But that raised a new problem: detecting microplastics isn’t the same as removing them.

    That gap became the question behind Eco Purge. A science fair project doesn’t have to solve a problem outright to be worth something. Sometimes its real value is the better question it leaves you with.

    Getting from question to prototype wasn’t smooth. The enzyme Satheesh needed wasn’t just hard to find, it was expensive: three milligrams cost around $2,500, well beyond what a student could reasonably buy herself. After being turned down more than once, she found Kevin O’Connor, director of BiOrbic, Ireland’s national bioeconomy research centre, who didn’t have the enzyme on hand either but offered to source it from suppliers in Denmark and Germany instead. She went on to work with researchers at Atlantic Technological University Letterkenny and University College Dublin to develop the prototype. None of that happened because the project arrived neatly resourced. It happened because she kept asking.

    The Real Science: How Enzymes Are Turning Plastic Against Itself

    Eco Purge is a plant-based bioplastic that carries enzymes inside its structure. Once discarded, it takes up to two weeks to biodegrade, and as it does, it releases those enzymes into the surrounding soil or water, where they get to work breaking down other PET-derived microplastics nearby, the kind of plastic commonly found in packaging and textiles.

    This isn’t invented chemistry. Scientists identified PETase, a bacterial enzyme capable of breaking down PET plastic, in 2016, building on research into PET-degrading enzymes dating back to 2005. What’s novel in Eco Purge isn’t the enzyme chemistry itself, it’s what the plastic does on two separate fronts at once: being biodegradable means it doesn’t linger in the environment the way conventional plastic does, and its embedded enzymes go a step further by actively breaking down microplastics that are already there.

    She tested the idea across three environments, soil, salt water and fresh water, over six weeks. By the end of the trial, both the Eco Purge and the microplastic sitting alongside it had visibly degraded in every case.

    What Made This Science Fair Project Stand Out

    Charles Rolsky, senior research scientist at the Shaw Institute, put his finger on the actual innovation. Most solutions to plastic pollution focus on reducing how much new waste enters the environment. Eco Purge does that too, but what Rolsky pointed to as the real distinction is that it also targets microplastics already out there, a shift he described as moving from passive containment to an active solution.

    That’s a transferable lesson for anyone judging or planning a science fair project: it’s not enough to build something that works. The strongest projects can say precisely what gap they’re closing that existing approaches don’t.

    The Honest Caveat: This Isn’t a Silver Bullet Yet

    Rolsky was equally clear about the limits, and they come in two distinct forms. The first is chemical: enzymes work on a lock-and-key basis, so one tailored to Eco Purge’s PET-derived target won’t affect the different plastic types mixed into most real-world waste. In open environments like oceans, he noted, released enzymes would also probably dilute into the surrounding water, limiting their contact time with microplastics, so realistic deployment is more likely confined to controlled settings like compost facilities.

    The second limit is industrial. Standard plastic processing runs on high heat, which Rolsky said typically destroys the delicate biological enzymes Eco Purge depends on, making it hard to scale production to a commercial level without struggling to compete with the low margins of traditional packaging. That’s not a scaling detail to iron out later, it’s a real unsolved problem sitting between the prototype and any large-scale use.

    Satheesh herself has described this as a starting point, not a finished solution, and plans to spend the next several years refining the material toward applications like packaging and garbage bags. That honesty matters. Overselling results is one of the more common ways a strong project gets undermined at judging, and being upfront about what’s still unsolved is part of what made this one credible.

    What This Means If You’re Planning Your Own Science Fair Project

    For more student-led invention stories in this vein, see our Young Scientists section.

    Treat a limitation as your next question, not a dead end. Her water monitor worked. It also revealed a problem it couldn’t solve. That gap became the actual project.

    Ask people you haven’t got an obvious reason to expect help from. Rejection didn’t stop the search for enzyme suppliers, it just meant finding the next person to ask.

    Say exactly what problem you’re solving, and be equally clear about what you haven’t solved yet. The strongest case for Eco Purge wasn’t the working prototype alone, it was a precise account of the gap it closes and an honest account of its limits.

    So the next time a project you’re working on hits a wall it can’t get past, that’s not necessarily the end of it. It might be the point where the more interesting project actually starts.

  • Student Inventors Turn Rubble Into a $12,500 Prize

    Some of the best work by student inventors doesn’t come out of a lab. Sisters Tala Mousa, 17, and Farah Mousa, 15, from Gaza, found a way to turn rubble from destroyed buildings into reusable bricks. They used basic hand tools and materials they could find locally. Their project, Build Hope, Palestine, made them the Middle East Regional Winners of the Earth Prize 2026, the first Palestinian team ever to win a regional title in the competition’s history. It earned them $12,500 to develop the idea further.

    What makes these student inventors worth studying is what their project demonstrates. Real engineering doesn’t need a fully-equipped lab, expensive materials or specialised machinery.

    How Two Student Inventors Turned a Problem Into a Solution

    The sisters are currently living with their family after losing their home. They saw rubble becoming a constant part of daily life around them. Rather than treating it as waste, they asked a different question: could it become something useful instead?

    Their answer, Build Hope, starts with crushing and sieving rubble down to a sand-like consistency, using manual tools including a simple hammer. They mix that crushed material with water and a locally available binder, clay, ash, straw or glass powder. Then they pack the mix into a homemade wooden mould. The blocks stay in the mould for two days, then dry outside it for another five, about a week in total. The result is a non-load-bearing block for uses like garden beds, pavements and partitions, a local resource made from a local problem.

    They didn’t develop the process alone. Their grandfather, who had relevant hands-on experience, helped them work out the practical details. Knowing who to ask, even within your own family, is as much a part of engineering a real solution as the idea itself.

    The Engineering Behind These Student Inventors’ Method

    Rubble-and-binder blocks work on a similar principle to older, low-cost building methods like adobe or rammed earth. Builders compact an aggregate with a binder and let it dry into a solid, non-structural material. That’s general context, not something reported about Build Hope specifically. But it shows why the sisters’ method isn’t a shot in the dark. Crushing material into finer particles is a well-established way to help a binder hold a mix together more evenly, though the final strength depends on far more than particle size alone. None of this needs a laboratory to understand or apply. It’s a principle low-cost construction has used for a very long time, aimed here at a new source material.

    Student Inventors Who Built to Be Taught, Not Just Used

    What sets these student inventors apart from a one-off invention is their plan for the prize money. Rather than simply producing more bricks themselves, they intend to run hands-on workshops training around 100 young people. Their goal is to produce at least 200 blocks. The sisters hope those trainees will go on to teach others too. They’ve said they want to eventually reach over 1,000 people, though that’s an intended outcome, not something that’s happened yet.

    Design for others to repeat it, not just for yourself to finish it.

    A lot of strong projects stop at ‘I built something that works.’ Fewer take the extra step: building something other people can build too. If you’re planning your own project, ask yourself directly. Is what you’ve made something only you can do? Or something you could hand to someone else, and watch them succeed with it?

    The Honest Limits of the Idea

    Build Hope solves a real problem, but not the whole problem. The blocks are non-load-bearing. As things stand, they can’t replace the materials needed to rebuild homes. They only support secondary uses like paving, partitions and garden beds around that rebuilding.

    A resource-limited setting is a design constraint, not a disqualifier.

    Ask people with relevant experience, even close to home. The sisters didn’t need to look far for expertise. Their grandfather’s practical knowledge filled a real gap.

    Build Hope makes both points at once. The constraints shaped a genuinely useful design. The sisters also built that design from the start so they could hand it to someone else. Either lesson works on its own. Together, they’re what actually made this a prize-winning project rather than just a resourceful one.

    For more student-led invention stories, see our Young Scientists section, including how one science fair project turned a dead end into a prize-winning idea.