Today marks the first time the Large Hadron Collider will attempt to circulate a particle beam. This new tool in the belt of particle physicists should help prove/disprove some current grand unified theories, including the existence of the Higgs Boson, thought to be responsible for giving mass to particles.
While some people have been worried the LHC will cause some crazy reaction that will end in the destruction of the Earth (say, via a black hole), Cory Doctorow in a post at Boing Boing quoted a physics who said of the chances of the LHC destroying the Earth: "Look, it's a 10^-19 chance, and you've got a 10^-11 chance of suddenly evaporating while shaving."
In honor of this grand event, I post below the LHC Rap, which is a surprisingly good song about the LHC. If you weren't listening too closely, you could almost mistake it for a Digable Planets song (almost).
To learn more, check out CERN's home for the Large Hadron Collider.