Google has added a new feature to NotebookLM that allows the AI note-taking tool to find its own web sources.Users can now tap the "Discover" button and describe a topic they want to learn more about.NotebookLM will search through potential web sources and provide up to ten recommendations with summaries explaining their relevance.This is the first of several Gemini-powered NotebookLM features that aim to make it easier for users to find relevant reference materials.