NotebookLM is an extraordinarily fun experiment to use. I just got access earlier today and it's really something else. You dump a bunch of text sources into a “notebook” and that trains an LLM so you can interface with it about your specific sources (with citations).

I gave it a bunch of research papers I archived from my college days. As a chatbot, it’s whatever. As a search engine, it’s incredible. This is the best way to search a large corpus of papers.