As you probably heard, they switched on the Large Hadron Collider yesterday deep in the ground under the France-Switzerland border, and notwithstanding some predictions, no black hole was created, and the universe, as far as we can tell, continues to exist. [The Telegraph lists 10 other days when the world was supposed to end but didn't here]
In a slightly more serious vein, check out the absolutely stunning photos of the LHC posted here. It looks like something out of a wild sci-fi fantasy movie . . . just what you'd want the world's largest machine to look like.