Two recent studies have shown the microplastics, tiny pieces of plastic by definition less than 5 mm but can be microscopic, have been found deep in the tissues of most humans. One study from the Netherlands found microplastic particles in the bloodstream of 77% of healthy volunteers. Another study looked at the lung tissue of patients undergoing surgery and found 84% of the samples contained plastic. Another study by the University of Newcastle, Australia estimated that the average person...