The Large Hadron Collider is both the world's largest machine and the largest atom smasher ever created. Many believed that the device would create microscopic black holes that would destroy the Earth.
The LHC was started yesterday, and has already produced its first images. As you can tell, the world hasn’t ended. The catch according to naysayers is that the LHC hasn’t started producing sub-atomic collisions yet, which are supposedly needed to create black holes.
Before the sub-atomic collisions can be started, the scientists need to get a proton beam to run in an opposite direction. We won't be out of the woods in the minds of dooms day predictors at least until the sub-atomic collisions commence.