500 Largest NSF Awards archived on www.nsf.govClick once on a node to center it. Click twice on a document node (green) to display it. If the tree doesn't appear click on the screen... or reload your browser. Please click on the "Left" button for a better view of the descriptions and don't take into account the legend.
The "NO ABSTRACT FILE" node contains Awards without abstracts, only their title is taken into account. The hyperbolic tree includes nodes annotated with "Other topics" which aren't terms from the documents. Such nodes are created to prevent the root or other nodes from branching into too many small clusters.