A star gone supernova 4000 years ago could scorch a hemisphere in the next minute with very little warning. Old news for astronomers and the paranoid. What would that be like having everything going up in toast where you are right now? How about now? Now?
What if you had been in a parking garage? How would you live once you saw what happend? After a year, everything would start growing back and the rest of the world would only start on the fringes of the Doom Zone. Memorize these videos. The lack of narration makes them strangely restful.
Scavaging for civilization would be deadly dangerous. Identifying warning logos would have been burnt away. The rewards for finding the correct gasses would be great as they could be used for everything from air conditioning to fuel to weapons against rival gangs. Here’s a fellow who knows all of the uses at “Things I Won’t Work With”. Touch the deadly molecule to learn more.