Plastic people - no way

There are also untold numbers of extremely small plastic fragments in marine waters. Plastics are non-biodegradable and merely break down into smaller and smaller pieces with exposure to sunlight. These fragments, known as microplastics, are less than 5 millimeters long, or about the size of a sesame seed. Some are microbeads , tiny pieces of plastic that are added as exfoliants to health and beauty products, while others come from larger plastic pieces that have degraded over time.

The last one on my list is such an important way of grouping plastics that we'd better look at it in a bit more detail. What's the difference between thermoplastics and thermosets—and how can we explain it?

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