Richard Dawkins will be doing a Reddit AMA (ask me anything) 11/26/2013 11am EST
There is no direct link to the discussion until it is live. To be sure to get in on the AMA while it's live get to http://www.reddit.com/r/iama/new before the set start time and refresh around the 11am. Once you see the "I am Richard Dawkins...." post jump in and start asking questions.
You will need to sign into your Reddit account or make one (free) to ask questions but not to read them.
As with all Reddit AMA's there is no guarantee the guest will respond to your question.