This Is Not A Test Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email 'The Memo,' Selective Disclosure and the Fight for True Transparency An Apocalyptic Tick-Tock The Day After, Today What The Simpsons Can Teach Us About Nuclear Apocalypse A 15-kiloton test fired from a 280-mm cannon on May 25, 1953 at the Nevada Proving Grounds. ( National Nuclear Security Administration ) Produced by WNYC Studios