Researchers tested a natural solution for cleaning polluted water from an old mining lake in Malaysia. They used a special fungus called Ganoderma lucidum in a system called BioDeF that acts like a sponge to remove dirt and discoloration from contaminated water. After just 48 hours, this fungus-based system removed over 90% of the water’s brown color, offering a cheap and eco-friendly alternative to traditional water cleaning methods.