What is the fine-grained topic of the following text: While Marvel had successfully mined "superhero team as nuclear family" with the Fantastic Four and "superhero as sad-sack teenaged nerd" with Spider-Man, The X-Men's basic dynamic (teenagers with special powers that manifest at adolescence living in a boarding-school environment) needed things that studiously-clean comics of the era wasn't prepared to provide: Puberty. Only return the topic.
Teenagers with special powers in Marvel's X-Men comics