What will the end of the world be like?Plague or nuclear fire? Asteroids or floods?Divine wrath or people meddling with what should have been left alone?The apocalypse may come in the future, but what apocalypses might have occurred if history had played out differently? What if nukes had flown during the Cuban Missile Crisis? What if an asteroid had been on a collision course with Earth before the first person could set foot on the Moon? What if humanity destroyed it...