What are the "Extra Dimensions" in the LHC experiment?
First of all, I'd like you people to know that I'm a 10th grader. So yes, silly questions may follow.
As the topic says, I want to have an idea of what the 'extra dimensions', that might possibly be discovered in the LHC experiment according to the CERN report, really are.
-Are those something like "Parallel universes", the things we see in comics and sci-fi stuff? Different people, or our doubles, living in the same space, which is not actually the same. Is it something -roughly- like that?
I tried to google it but most of the stuff there just went right over my head. Also, I request you to be as simple as possible, as I'm yet learning the basics.