As a result, their math grades overtook those of the other students by the end of the first semester—and the gap between the two groups continued to widen during the two years we followed them.

As a result, their math grades overtook those of the other students by the end of the first semester — and the gap between the two groups continued to widen during the two years we followed them.

Specific drug–polymer interactions are engineered by optimizing the lactide to glycolide ratio and including specific polymer end groups.