Scientists design custom nanoparticles with new `stencil` method
(PHYSorg.com Nanotechnology)

Nano-sized particles already make bicycles and tennis rackets lighter and stronger, protect eyeglasses from scratches, and help direct chemotherapy drugs to cancer cells. But their usefulness depends on being able to precisely sculpt them into the right configurations-no easy task when they`re so tiny that thousands of them could fit into the thickness of a sheet of paper.