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PFAS, often called "forever chemicals," are notoriously difficult to remove from the environment. Their extreme chemical stability means they can persist in water and the human body for decades, creating a major global pollution challenge. Now, researchers have made an important discovery that could change how we tackle the problem. In a new study, scientists found that PFAS can be broken down using intense light, without adding chemicals. But the real breakthrough is how this happens. The study shows that hydrogen radicals — highly reactive species formed from water under UV light— play a central role in the process.