Something crossed a boundary scientists assumed still held.

Until recently, some parts of the body were considered protected by biology itself. Barriers existed for a reason. They filtered, blocked, and decided what was allowed through. New findings are now challenging that assumption. Researchers examining a place meant to protect life found traces of something entirely foreign, material designed to last, not belong. The discovery raises questions about how far modern pollution has traveled and what it means when substances created for convenience begin appearing where separation was once absolute.



