The CERN experiments could reveal more about "dark matter," antimatter and possibly hidden dimensions of space and time. It could also find evidence of the hypothetical particle — the Higgs boson — believed to give mass to all other particles, and thus to matter that makes up the universe.

Some scientists have been waiting for 20 years to use the LHC. But even their younger colleagues are excited that startup has finally arrived.

"I think it's a very important project," said Katie McAlpine, 23, a Michigan State University graduate who made a rap video about the project.

"It's mostly out of scientific curiosity, what is the universe made of? How does it work? What are the rules? That's very exciting and it's important to advance our knowledge," she told Associated Press Television News.

She said she was surprised by the success of the video, which has had more than a million views on YouTube and which has received approval from CERN for its scientific accuracy, especially in its success with young people.

"I was really hoping that this would get taken into classrooms," McAlpine said. "I don't imagine that elementary school and most middle school children will understand it very well, but a lot of parents have e-mailed me, saying I have a 9-year-old or a 7-year-old and showed them your rap and they really love it.

"If elementary kids can get excited about it, too, that's just great."