DepthHub gathers the best in-depth submissions and discussion on Reddit. You can use [the DepthHub](http://www.reddit.com/user/Lapper/m/depthhub) as an alternative front page with high quality discussion and inquiry. For more on the theory of DepthHub, [read this post from our founder](http://redd.it/bkd0n).
A subreddit for really great, insightful articles and discussion. Please follow reddiquette, and READ THE ARTICLE before voting or discussing. Downvotes should only be used if something doesn’t contribute to intelligent discussion, not just because you disagree. Please use the report button if you see something that doesn’t belong.
The aim of /r/Physics is to build a subreddit frequented by physicists, scientists, and those with a passion for physics. Papers from physics journals (free or otherwise) are encouraged. Posts should be pertinent, meme-free, and generate a discussion about physics. Please report trolls and intentionally misleading comments.
Freethought is an open forum dedicated to rational, logical and scientific examination of culture, politics, religion, science, business and more! Freethinkers reject claims and beliefs which are not testable and verifiable using established scientific methods, and encourage a society that espouses the priority of rationality and reason over dogma, emotion and pop doctrine.
Science Fiction, or Speculative Fiction if you prefer. Fantasy too. Asimov, Bradbury, Clarke, Dick, Heinlein and other SF books. SF movies and TV shows. Fantasy stuff like Tolkien and Game of Thrones. Laser guns, space ships, and time travel. etc. Star Trek, Battlestar, Star Wars, etc.