By Roman Aglaganov
NotebookLM is Google’s AI research notebook: you upload sources such as PDFs, web pages and notes, and it answers questions using only those sources, with citations back to the exact passage. Useful, sensible, slightly dull. Then, in September 2024, it learned to do podcasts.
Two hosts, zero microphones
The feature, called Audio Overviews, turns your documents into a conversation between two AI hosts who summarise, banter, interrupt each other with “right, right” and occasionally say “wow”. Feed it a dense research paper and you get a breezy deep-dive you can listen to on a walk.
It went viral almost immediately. People fed it their CVs, their PhD theses and their shopping lists, and the hosts treated each one as the most fascinating document they had ever read.
Why it matters
Audio Overviews showed that the most memorable AI products are not always the most powerful models, but the ones that package AI in a format people already love. It also showed how natural synthetic voices have become, which is delightful for commuters and worrying for anyone who still trusts a voice on the phone.
The catch: the hosts sound confident even when a summary is shallow or slightly off. Use it as an appetiser, not as a substitute for reading the thing.
