Theresa Dankovich is a Carnegie Mellon scientist who invented the pAge filter, a silver-nanoparticle-coated paper water filter that kills 99.99% of waterborne bacteria and viruses. In 2016, she founded Folia Water to develop pAge filters into a product that can be distributed globally to people who lack reliable access to safe drinking water, particularly those living on less than $2/day. Each 10-cent pAge filter can provide several weeks of potable water for a single user; a backpack full of these filters can purify water for a village of 500 people for a year. In 2014, Dankovich's nonprofit organization, pAge Drinking Paper, collaborated with Water Is Life and designers at the ad shop DDB Worldwide to package her creation into "The Drinkable Book." The book combines Dankovich’s paper with a filter tray and purification instructions and is being printed in a number of languages to be distributed globally to reach the 783 million people in need. Each book boasts enough sheets of the filter paper to provide up to four years of potable water for each user.