At the height of the Cold War, a terrifying concept emerged: a bomb so powerful it wouldn’t need to be dropped. Known as Project Sundial, this doomsday device would have left a 400-km radius in flames and plunged the world into darkness. It was a bomb that would destroy everything – not a weapon, but an apocalypse. How close did we come to pressing the button? | Kurzgesagt

A nuclear explosion is not just a regular, loud explosion. It creates a blistering bubble hotter than the sun, burning everything for kilometers. But the real horror comes after: a deadly cloud forms, fueled by the fire it ignites. This cloud isn't just smoke, it's carrying soot miles high where rain can't wash it away. The real horror of nuclear war is the destruction that lingers for years. | Kurzgesagt