Hon Weng Chong: Paging Dr. Smartphone

The Australian medical student has built a stethoscope that can plug into a smartphone and help diagnose pneumonia
Photograph by Katrin Koenning for Bloomberg Businessweek

Pneumonia kills more children than any other cause, according to the World Health Organization. While treatable with antibiotics, each year the lung infection claims roughly 1.4 million kids before their fifth birthday, 18 percent of under-five deaths. Most of the deaths occur in South Asia and sub-Saharan Africa, where access to doctors and drugs is limited.

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