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Enlarge ImageFast shuffle. Liquids of different colors stream from four inlets on the top of a microPAD into 64 predetermined reservoirs on the bottom.Credit: Martinez et al., PNAS 105 (50) (16 December 2008) To help doctors and health workers in developing countries diagnose diseases, researchers have developed simple detection devices made only of paper and adhesive tape that cost a fraction of conventional diagnostic equipment. The technology could also find uses in environmental monitoring and homeland security. The lab work that hospitals and clinics routinely perform in developed countries is often unavailable in Third World countries. Two primary reasons...