“The beauty of these nanoparticles is that they will not deliver this drug to any other place but the area of stress,” says Heyu Ni, platelet biologist at St. Michael’s Hospital in Toronto, Canada, specifically referring to blood clot sites. Another advantage of the approach, he says, is that it gets around the issue of estimating the amount of anticlotting medication to give a patient. High dosages are effective but could cause excessive bleeding, whereas small doses are much safer but may not get the job done. The nanoparticles skirt this problem by depositing a small amount of medication directly on the clot. He notes that the nanoparticles could be used as a diagnostic tool to seek out blockages that may need to be removed surgically, since places where the nanoparticles wind up are easier to spot with ultrasound. “This »