I thought I would post a very basic definition of all these theories so that everybody will realise what we are talking about. Please note, I do not subscribe to any of these theories as a belief system, they are what they are, theories, all of them are unproven.
For those that which to explore any of these theories, there are an abundance of books and internet sites where information can be found. Always check the credentials of anyone who proports to know that these theories are proven, they are lying, or giving their own biased opinion of the data.