Growth often appears in discarded markets. I thought Theranos would set back cheap blood testing for a long time. But the Israeli company Sight Diagnostics samples two drops of blood and takes 1,000 digital images at varying illumination, then uses machine learning to identify levels of blood cells, platelets, hemoglobin. Sight CEO Yossi Pollak says they can identify malaria and perhaps “features relevant to diagnosing certain cancers.”

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