In 1965, two Bell Labs engineers thought their antenna was broken — what they were actually hearing was the first echo of the Big Bang, a 13.8-billion-year-old signal hiding inside what they dismissed as pigeon droppings and bad equipment. This episode traces the accidental discovery of cosmic microwave background radiation: the physics of why the universe still glows from its own birth, the parallel theorists who almost missed sharing the Nobel Prize, and what it means that our deepest cosmological proof arrived as an unwanted noise complaint. Science, it turns out, doesn't always announce itself.