MicroPADs transported four separate liquid samples to 64 designated reservoirs within 5 minutes. In 27 out of 30 tries, the devices moved the liquids without mixing them. That means the microPADs theoretically can simultaneously test for thousands of potentially harmful chemicals--such as dioxin, lead, or mercury--and for diseases such as diphtheria, malaria, or typhoid. And the results can be transmitted from fieldworkers to centralized laboratories by taking a cell-phone photo of the results on the colored dots (see photo). The researchers estimate that each microPAD could cost as little as 3 cents when manufactured in commercial quantities.
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