Polio, fought by cellphone
The battlefield is northern Nigeria, where thousands of children go unvaccinated. Half of the world's new polio cases appear here. A task force that includes the Bill & Melinda Gates Foundation and the Environmental Systems Research Institute is using satellite imaging, smartphones, and crowdsourcing to help fight the disease. Today, inoculation workers armed with 10,000 GPS-enabled cellphones fan out across the countryside, mapping their progress in real time and targeting their efforts toward polio hotspots.
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