Ever wondered what happens to your to your old mattress when you throw it away? Well, it will probably sit in landfills for the next 120 years, slowly decomposing into the earth while leaching harmful chemicals into the environment.<\/p>\n\n\n\n
Which is, clearly, not ideal.<\/p>\n\n\n\n
But Dr. Peter Nguyen and his team at Swinburne University in Australia have a solution. They took the foam from old mattresses (the bulky polyurethane stuff that’s nearly impossible to recycle), shredded it, and fed it to a fungus. Not just any fungus, but Penicillium chrysogenum<\/em> – a close cousin of the mould that gave us penicillin, one of humanity’s greatest medical breakthroughs.<\/p>\n\n\n\n And the fungus turned that waste into something a lightweight, fire-resistant insulation material that can withstand temperatures up to 1,000\u00b0C, matching the thermal performance of commercial building insulation already on the market.<\/p>\n\n\n\n The study<\/a>, published in Scientific Reports<\/em> in December 2025, is a masterclass in circular thinking. But it’s also a reminder of how fungi are nature’s original recyclers, regenerators, and problem-solvers. What they do with mattresses, they’ve been doing for millions of years with dead trees, organic matter, and complex ecosystems. They break things down, they build things up, and they transform things. We can learn a lot from that. <\/p>\n\n\n\n The process Nguyen’s team developed is beautifully simple. They took shredded polyurethane foam – the kind that’s been piling up in landfills since the 1950s – and inoculated it with fungal spores. Over 30 days, the fungus colonised the foam, its thread-like mycelium acting as a natural biological glue, knitting the fragments into a solid, cohesive material.<\/p>\n\n\n\n But as the fungus grew, it did more than just bind the foam. It transformed it. Through enzymatic hydrolysis, the fungus broke down the urethane bonds in the foam, releasing carbon dioxide in the process. That CO\u2082 reacted with calcium in the growth medium to form calcium carbonate (CaCO\u2083) – specifically, the calcite phase, which is the same mineral found in limestone and seashells.<\/p>\n\n\n\n This biomineralisation (the creation of mineral structures by living organisms) gave the material its exceptional heat resistance. At 997\u00b0C, the mycelium-mattress composite retained over 90% of its weight, vastly outperforming commercial glass wool, which completely disintegrates by 992\u00b0C.<\/p>\n\n\n\n The material’s thermal conductivity measured 0.048 W\/m\u00b7K, right in line with sheep wool, recycled cellulose, and other sustainable insulators. In other words, it works.<\/p>\n\n\n\n One of the most fascinating aspects of Nguyen’s study is what it reveals about fungal intelligence. P. chrysogenum<\/em> doesn’t have a brain. It doesn’t “think” in the way we do. But it still solves problems. It adapts to its environment. It breaks down complex polymers that would take over a century to degrade naturally and transforms them into stable, functional materials in just 30 days.<\/p>\n\n\n\n This is decentralised intelligence, distributed across a network of mycelial threads, each responding to local conditions, sharing resources, and collectively achieving what no single part could do alone. It’s the same principle behind decentralised systems in technology, economics, and even neuroscience.<\/p>\n\n\n\n Your brain is a decentralised network too. Neurons don’t work in isolation. They work in patterns, in circuits, and in feedback loops. Damage one area, and other areas can compensate. This is neuroplasticity in action, and it’s fueled by the same metabolic resilience that allows fungi to thrive in extreme environments.<\/p>\n\n\n\n Mushrooms teach us that resilience doesn’t come from rigidity. It comes from flexibility, adaptability, and the ability to reorganise energy in response to stress.<\/p>\n\n\n\n We live in a linear world where take, make, and dispose. It’s the logic of short-term thinking, and it’s killing us and the planet.<\/p>\n\n\n\n But nature thinks in circles. Energy is never destroyed, only transformed. Waste from one organism becomes food for another. Death feeds life. Decline becomes regeneration.<\/p>\n\n\n\n Fungi embody this circular logic. They don’t just break things down, they redistribute energy<\/em>. They connect the dying tree to the seedling. They turn the corpse into soil. They transform the discarded into the useful.<\/p>\n\n\n\n The economy needs the same circular thinking if it’s to survive and thrive. And so does your brain and boody. You can’t just pour in stimulants and expect peak performance. You need to support the whole system<\/em>: energy production, inflammation control, waste clearance, and structural repair. That’s why I created Mushies<\/a>, where we offer the biological wisdom of fungi in handy capsules.<\/p>\n\n\n\n When I first read Nguyen’s study, I thought: “That’s cool. Fungi can recycle mattresses.” But the more I sat with it, the more I realised it’s not just about recycling. It’s about transformation<\/em>.<\/p>\n\n\n\n The fungus didn’t just bind foam scraps together. It broke down complex polymers, released CO\u2082, mineralised calcium carbonate, and created a material that can withstand 1,000\u00b0C.<\/p>\n\n\n\n So next time you see a discarded mattress on the side of the road, remember that even waste has potential. Even what seems broken can be rebuilt.<\/p>\n\n\n\n And fungi are the perfect representation of the power to transform.<\/p>\n\n\n\n Want to learn more about mushrooms and fungi? <\/strong><\/p>\n\n\n\nThe Alchemy of Mycelium<\/h2>\n\n\n\n
Decentralised Fungal Intelligence<\/h2>\n\n\n\n
Circular Thinking<\/h2>\n\n\n\n
Final Thoughts<\/h2>\n\n\n\n
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