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In this interview, Dr. Chiara Mingarelli (Yale University) discusses how pulsar timing arrays are being used to detect gravitational waves from supermassive black hole mergers. She explains how pulsars act as incredibly precise natural clocks, how astronomers recently found evidence of a background "hum" of gravitational waves from millions of merging black holes across the universe, and how her latest research aims to pinpoint individual merging black hole pairs rather than just the overall background signal.