Harvard researcher David Weinberger: “In the West, knowledge begins as a winnowing process. … That idea … not by coincidence fits perfectly with the paper medium that we used for it. Paper is expensive, libraries are small, very few people can get published. … In the digital age we filter forward instead of filtering out. As a result, all that material is still available to us and to others to filter in their own ways, and to bring forward in other contexts.”