Israeli physicists have created a map of the Internet by linking nodes that represent service providers or large organizations such as Google and AT&T. Their view shows a dense nucleus of connections surrounded by a middle peer-connected layer and a sparsely connected exterior layer, which has to route information through the nucleus. Sending more information along the peer-connected layer might reduce Internet congestion, the group suggests in a paper published online this week in the Proceedings of the National Academy of Sciences USA.