They might not be as pretty as their much larger counterparts, but unlike a sparkling diamond ring, the tiny 1) ___ known as nanodiamonds, might actually end up doing some good in the world. Scientists at Northwestern University have demonstrated that these relatively new nanomaterials can shuttle 2) ___ drugs to cells without producing the negative effects of today’s delivery agents. Clusters of the nanodiamonds surrounding the drugs block them off from 3) ___ cells, preventing unnecessary damage, and then release them upon reaching the intended targets. Just as important, the leftover diamonds, hundreds of thousands of which could cram onto the eye of a 4) ___, don’t induce inflammation in cells once they’ve done their job. The study, the first to demonstrate the usefulness of the material in 5) ___, is published online in Nano Letters.

ANSWERS: 1) particles; 2) chemotherapy; 3) healthy; 4) needle; 5) biomedicine