February 13: The Day the Earth Rang Like a Bell

On February 13, 1967, a nuclear explosion in the Nevada desert sent shockwaves through the entire planet. For the first time, scientists could “listen” to the Earth and map its hidden layers using seismic waves. In this episode of History Happened Today, we explore how a Cold War weapons test accidentally transformed geology and helped humanity understand the planet beneath its feet. Sometimes history isn’t written. It’s felt.