Ever wish there was a radio station dedicated to the Maillard reaction, beach agate hunting in Northern California, or natural hydrogen production? Narrowcast is a streaming radio service that produces deep-dive audio segments on topics too niche for traditional media. A multi-agent AI pipeline researches each topic across the web, writes an engaging script, fact-checks it, and produces the final audio - making it viable to cover subjects that couldn't justify the cost of human production.