More on Mars
Oliver Morton has a nice succinct discussion about what this announcement about the evidence of water on Mars does and doesn't mean. I hadn't seen his blog before, but it looks like a great source for explanation and commentary on Mars.

So it was a big announcement - but not a terribly surprising or incredibly dramatic one. Indeed you might argue that it was pretty close to being the smallest discovery that would still merit a big press conference at headquarters. Doesn't mean the news wasn't important or exciting. Just means -- and this is no surprise -- that speculation can outstrip the science pretty easily.

MainlyMartian: "Drenched" (via Electrolite)