Google NotebookLM

Google released NotebookLM, and it's the first AI tool I've used that actually changed how I study. Upload your own sources, lecture notes, PDFs, research papers, and the AI answers questions based only on that material instead of pulling from the entire internet. This matters because when I ask it to summarize a reading, the answer comes from the actual text my professor assigned, not some random blog post. Citations link back to the specific passage in your document. Verification takes about 5 seconds. For my political science class, where readings are dense 40-page policy papers, asking plain language questions like "what does the author think about federal housing subsidies" and getting a grounded answer saves real time. Clean but basic interface, which is fine because the tool itself does the heavy work. Shared notebooks let everyone on a group project work from the same source material. Document upload limits still exist, but for a free tool that respects the boundaries of your own material, it handles the job well.