Web usage data outline map of knowledge:
When users click from one page to another while looking through online scientific journals, they generate a chain of connections between things they think belong together. Now a billion such 'clickstream events' have been analysed by researchers to map these connections on a grand scale.
The work provides a fascinating snapshot of the web of interconnections between disciplines, which some data-mining experts believe reveals the degree to which work that is not often cited -- including work in the social sciences and humanities -- is widely consulted and can form bridges between scientific disciplines...
You can see the amazing network (Fig.5) here
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