Many fancier teas now come in silk bags instead of paper.
"This does not necessarily mean that they are harmless," a researcher notes.
As many as nine different plastics were detected in stool samples in the first study of its kind.
Microplastics were found in water from five different continents.
Their idea is up for a $50,000 prize.
How much are whiter teeth and smoother skin worth to you? Are they worth the water and fish in the Great Lakes? If you use the myriad other creatures the seas support? If you use personal care products such as exfoliators, body scrubs and toothpastes containing microbeads, those are the costs you could be paying.