An interesting hint of medicine to come from ScienceDaily; nanofactories, tiny artificial structures that act like cells: "these ingested nanofactories, using magnetism, could detect a bacterial infection, produce a medication using the body's own materials, and deliver a dose directly to the bacteria. The drug would do its work only at the infection site ... we can produce a tiny nanofactory and attach it to a target cell magnetically. The nanofactory then makes small molecules from surrounding materials and delivers the molecules - potentially drug molecules - to the targeted cell. ... the nanofactory could produce signaling molecules that communicate with the target cell or block the target cell from communicating with other, similar cells (a process called 'quorum sensing') and thus prevent infection. The researchers attached the nanofactories to E. coli cells, targeting them with the help of a mixture of iron particles and chitosan ... The nanofactories then produced a signaling molecule that could render the E. coli harmless. Nanofactories could be designed to produce the needed drug molecules over an extended period of time."