Many of you here today are toolbuilders who help people work with data. Rather than presuming that those using your tools are clear-eyed about their data, how can you build features and methods that ensure people know the limits of their data and work with them responsibly? Your tools are not neutral. Neither is the data that your tools help analyze. How can you build tools that invite responsible data use and make visible when data is being manipulated? How can you help build tools for responsible governance?