Microplastics are tiny plastic particles under five millimeters found throughout the environment—in oceans, rivers, and sediments. Dr. Nathaniel Warner of Penn State explains they come from everyday sources like water bottles, clothing fibers, and tires. Humans ingest microplastics through food, water, and air, but the often-quoted “credit card worth” in our bodies may be exaggerated. Health impacts remain uncertain, but scientists continue studying to understand the risks better, facing challenges due to limited data and public misconceptions. 

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