ST. PAUL, Minn., April 22 (UPI) -- Patients who suffered strokes, mini-strokes or temporary blindness had levels of "nanoplastic" particles in their necks far higher than in healthy people, an abstract of a small-scale study released Tuesday shows. The abstract, released by the American Heart Association at the start of a scientific conference this week in Baltimore, is adding to a growing list of "troubling" evidence linking vascular disease to nanoplastics, the medical group says. Nanoplastic