New Hampshire beaches may look generally clean, but there's a big threat posed by tiny microplastics. Microplastics are defined as plastics between 1-5mm in size. They may be fragments of degraded larger plastic debris, synthetic fibers, or microbeads from cosmetics and toothpaste. We learn about research studying the prevalence of this microscopic debris on New Hampshire beaches, the threat it poses to marine ecosystems, and what we can do about it.