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# Public root
Thisis the highest level publicnode , from which allother public nodes descend. For instance,Physics, Mathematics, Chemistry, Biology, Linguistics, Philosophy are examples of the level of generality that may be appropriate for the first generation ofdescendants. For the second generation, the descendants, e.g., of Physics are Condensed Matter Physics, High-Energy Physics, etc. The number of descendants of any given node should be small, less than 10 or so. If more children appear, it meansthat some of them can be combined into a more generic node, with the details transferred into grand-children. For instance, an intermediate node Natural Sciences can be created under * *Root** that combines general aspects of Physics, Chemistry, and Mathematics, with themselves becoming children of Natural Sciences. *Rewiring is easy! *The idea is to keep every node compact, limited to about apage of text. This way it can be easily perceived, as well as conveniently modified. Each node is a logical unit, self-contained for its level of generality/specialization. The hierarchy goes from the most general -- the * *Root**-- to more specialized, typicallythe forefront of currentresearch . ⏎ **Feel freeto edit any node as well as add descendant nodesto any node, including this one.**Note that all nodes that descend from * *Root** are public -- they can be read and edited by any logged in user. ⏎⏎If you are interested in creating your private project with access limited to you and your collaborators, create a child node under **My Trees**. Later on, you can make your private project *visible* to the general audience by adding an appropriate public parent (* *Root** or one of its descendants), or make it completely public .