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Admittedly, it's kind of lonely to be the only contributor at a topic. It's much more fun for us to focus our attention on the same nodes. Working together on a few nodes is very effective because we can quickly review each others' posts and identify good ways of explaining each concept.
At any given time, we'll have some nodes highlighted for the world's attention. Think of them as "contribute here!" signs. These nodes have at least one lesson already, but they are in need of more contributions. Just follow the yellow trails (or brick road?) to find where others are :)