Cholera is a preventable and easily treatable disease, but it presents a huge threat in developing countries—every year, there are between 1.3 and 4 million cases worldwide, resulting in up to 143,000 deaths. Sadly, nearly 1.8 billion people around the world drink water that can carry the cholera bacterium. Now two female researchers, Jacqueline Linnes and Tamara Kinzer-Ursem have developed a smartphone-based platform to help detect disease pathogens before they spread. PathVis is a mobile tool that puts a lab in the palm of your hand.