After a crisis, how can we tell if water is safe to drink? Current tests are slow and complex, and the delay can be deadly, as in the cholera outbreak after Haiti's earthquake in 2010.
The 'Water Canary' is a device to quickly and affordably test if a water supply is contaminated or not. By geocoding the data, when can map out medical outbreaks of malaria and contain the spread of diseases. This seems simple, but it can be revolutionary in how humanitarian aid and emergency relief work is done.