Lack of access to adequately clean water is the second most common cause of death of children under the age of five in developing countries. A team of nine students participating in the 2012 iGEM (International Genetically Engineered Machine) competition has resulted in a DNA-based, user-friendly biosensor that can detect major pathogens. This device can find use in developing countries where access to water is constricted, and people consume water without first ensuring its safety. Read more here.