Asteroid impacts! Cometary debris! Extinction level events! These are the ways the world might end, and these are the topics of “Death from the Skies!”, a scientifically-based but fun look at giant impacts from cosmic objects. Astronomer Phil Plait talks about how these events have shaped our history, how they may do so again, and why Hollywood always seems to get them wrong. And lest you think it’s all doom and gloom, it's possible to prevent a huge impact from ruining our whole day... if we choose to do so.