Rotifers eat microplastics, then cannot digest them, but split them up into enormous numbers of much smaller nanoplastic particles.

The nanoplastic particles can get into smaller organisms, further down the food chain, which means they go through more levels of concentration before they reach the sea animals that we eat. If they are harmful, which no one knows, that would make them more harmful.

It's a world-wide experiment being carried out on all humans and most other animals, all at once.