 This "militant irony" (or sarcasm) often professes to approve (or at least accept as natural) the very things the satirist actually wishes to attack.Science fiction is similar to fantasy, except stories in this genre use scientific understanding to explain the universe that it takes place in.It generally includes or is centered on the presumed effects or ramifications of computers or machines; travel through space, time or alternate universes; alien life-forms; genetic engineering; or other such things.