One of the fun aspects of Supermanica that was not included in the Great Superman Book is the addition of the Category "Theoretical Concepts" which includes short articles on Earth-E, Imaginary Stories, Miracle Monday, the Multiverse, Parallel-Worlds, and Time Travel.
In general these are scientific (or science fictional) concepts that have been treated in an often contradictory manner in the comics.
I've been toying with the idea of adding a few more: Magic, Anti-Matter. It would be great if some of the more scientifically inclined members here could try their hand at sketching out how these concepts have been used in the comics, especially if we can dig up specific examples (issue number, date, title).
I know that Superman must have used the phrase "alien dimension" or "another dimension" about a billion times but how are dimensions different from parrallel worlds? So I've added the already-existing "dimensional realms" to Theoretical Concepts.
What do you all think?
Any other ideas? Black Holes? Space Warps?
http://superman.nu/wiki/index.php/Category:Theoretical_Concepts