You’ve heard the story a million times. Giant lizards ruled the Earth until a comet or a meteor the size of Mount Everest wiped them all out. Except they weren’t lizards. Or as giant as we thought. Or were completely wiped out by a comet. We revisit the odd history of what scientists thought killed the dinosaurs and how, why the debate was never really settled, and how the controversy that’s almost never covered became a long-running battle of ideas between two theories, both with solid evidence and very compelling data to make their case.