A tiny new particle could pack a powerful anticancer punch, promising to speed diagnosis and pinpoint drug delivery. Conventional nanoparticles can only carry cancer-fighting materials on their surfaces, limiting their effectiveness. In contrast, the new 'Janus' nanoparticle has a porous interior that lets it carry cancer tests and treatments at the same time. Other uses for the new particle include delivering fluorescent dyes to illuminate cancer cells, making them easier for surgeons to find. This technological advance was presented at the 2013 Materials Science & Technology Conference in Canada.