Not all information is created equal. The bottom layers (the most ubiquitous, whose sources are the most ephemeral, and with the least amount of validation) lead to layers with greater dependability, all the way to the highest layers, made up mostly of academic resources maintained and validated by academic publishers that use multiple peer reviews, trained editors, and scholarly reviewers. When the system is effective, the layers serve to reinforce one another through clear pathways that allow queries to move from one layer to another with little resistance.
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