title: should everything connect with node 0 in neo4j
body: <p>In neo4j should all nodes connect to node 0 so that you can create a traversal that spans across all objects?  Is that a performance problem when you get to large datasets?  If so, how many nodes is too much?  Is it ok not to have nodes connect to node 0 if I don't see a use case for it now, assuming I use indexes for finding specific nodes?</p>