The Hypothesis Project is a 501(c)(3) with a mission to enable a conversation layer over the world’s knowledge. We envision a universal capability, native to browsers and other applications, allowing notetaking, collaboration, conversation and community over all forms of content– all without needing implementation by any underlying site. Our efforts are based on the annotation standards for digital documents developed by the W3C Web Annotation Working Group, and on open-source software standards and best practices.