Now, the medical community understands that there's a whole separate world of living organisms within your intestines, and keeping them balanced keeps you healthy. (blog.bulletproof.com)
It effectively engages players with not just the story but also to find out how these two separate characters in separate worlds have to do with each other. (jgghgames.com)
It then proceeded to separate the world into compartments each of which could be studied in separation from the others. (religion-online.org)