Combat in zero-gravity situations can be pretty messy, as any spilled blood or other fluids tend to float around and get all over everything. This piece, by artist John Gravato, illustrates such a scenario.
ABC News has an article on people who are preparing for the world to end in December of 2012, as predicted by the Mayan calendar. (Those of you who play Shadowrun are already familiar with this idea, as that game places Dec. 11, 2011 as the date of the Awakening, when magic returns to the world, on the same premise.) These people are even buying land and preparing caves as survivalist bases for when the End comes:
First, a polar reversal will cause the north to become the south and the sun to rise in the west. Shattering earthquakes, massive tidal waves and simultaneous volcanic eruptions will follow. Nuclear reactors will melt, buildings will crumble, and a cloud of volcanic dust will block out the sun for 40 years. Only the prepared will survive, Geryl said, and not even all of them.