For the first time, scientists have detected microplastics in the human brain, specifically in the olfactory bulb, which processes smell and lies above the nasal cavity. Researchers from Germany and Brazil found microscopic plastic fibers in the brain tissues of 8 out of 15 cadavers, suggesting that these particles can enter the brain through inhalation. This discovery challenges the belief that the blood-brain barrier protects the brain from such pollutants and raises concerns about the potential health risks, including neurodegenerative diseases. The most common type of plastic found was polypropylene, often used in everyday items like packaging and clothing. The study, published in JAMA Network Open, underscores the pervasive presence of microplastics in the human body and highlights the need for further research on their health impacts.