Sixty-six million years ago, a single catastrophic moment set in motion a chain of atmospheric consequences that would silence the age of dinosaurs — not through the blast itself, but through what drifted down afterward. New research from Purdue University proposes that fine asteroid dust, arriving after the initial rain of molten beads, acted as a planetary heat trap, raising surface radiation to levels that would have been unsurvivable for any creature caught in the open. The study invites us to reconsider extinction not as a single blow, but as a sequence — a physics problem written in dust