I have always wondered if dark matter can't simply be explained away by us just getting gravity completely wrong. That is really the only way we define it after all. -Since we have yet to get gravity right after so much time, that's my wager. Some day, I hope in my lifetime, we will see gravity fall into place. All that aside, this was a great video. I want to make an evening of them!
I hope you get as excited as I was to have found a much more intuitively correct hypothesis- but be warned: it flatly rejects many sacred cows.
Start here, and read from beginning to end. Epiphany follows :)
http://www.electric-cosmos.org/indexOLD.htm This is an excellent supplement to the above:
http://www.haltonarp.com/articles I hope you find them useful :)
More on the four forces here. http://tinyurl.com/68rcv5v