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Bones are the building blocks of our skeletons—they give our bodies structure and allow us to walk, dance, and pick things up. Healthy bones are strong, lightweight, hard, and even able to fix themselves when they get worn out or damaged. But if bones get sick, they can no longer repair themselves and they start to break down. One disease that makes bones sick is called osteoporosis and it can be very painful. Currently, doctors cannot cure osteoporosis. While there are medications to slow bone loss, there are no safe treatments to repair bone that is already damaged. Therefore, doctors and scientists are working together to find ways to prevent and even cure diseases like osteoporosis. One important challenge that needs to be addressed is: how can medicine be delivered to sick bones? In this article, we discuss how tiny carbon nanoparticles could help doctors deliver medicine to sick bones to repair them.