action adventure alieninvasion anthologies categories colonization cyberpunk ender ender(fictitiouscharacter) exploration extraterrestrialbeings fantasy fiction folk galacticempire geneticengineering genrefiction hardsciencefiction historical humor indigenous kindleebooks kindlestore literature military nativeamerican occult otherreligions paranormal post-apocalyptic practices religion romance sacredtexts satire sciencefiction shortstories spaceopera spirituality superheroes tribal ufos unitedstates wiggin