Racism. Homophobia. AIDS. Anti-Semitism. Socialism. Prejudice. Puberty. These subjects aren't your typical fodder for comic books, but for the past 60 years, these kinds of themes have been at the heart of Marvel's mutant superhero squad, the X-Men. Partially born out of laziness (yes, really), the X-Men have become an integral part of the Marvel universe, and their comics have been a place where boundaries have been pushed and diversity embraced. No other heroes have represented the underdogs, misfits and outsiders quite like the X-Men — and it's helped make the mutants one of the most cherished teams in the...