Phil Plait is one of my favorite bloggers. He writes about science, and debunking stupidity, on Bad Astronomy. He was also on Discovery Channel’s How the Universe Works. He’s a very smart guy and I highly recommend you nerds read his stuff.
In his TEDx talk from this past September, Plait scares the crap out of us about the possibility of an asteroid hitting the Earth. But then he makes it all better with a look at what we could do about it.