String Theory/M Theory the current goal of many scientists to prove. It's quite an insane theory and hard to understand, this series below tries. It's pretty decent if a little flashy. If you want to know it better watch this:

The Elegant Universe
Episode 1:
YouTube - The Elegant Universe Part 1: Einstein's Dream (1/5)
YouTube - The Elegant Universe Part 1: Einstein's Dream (2/5)
YouTube - The Elegant Universe Part 1: Einstein's Dream (3/5)
YouTube - The Elegant Universe Part 1: Einstein's Dream (4/5)
YouTube - The Elegant Universe Part 1: Einstein's Dream (5/5)

Episode 2
YouTube - The Elegant Universe Part 2: String's The Thing (1/5)
YouTube - The Elegant Universe Part 2: String's The Thing (2/5)
YouTube - The Elegant Universe Part 2: String's The Thing (3/5)
YouTube - The Elegant Universe Part 2: String's The Thing (4/5)
YouTube - The Elegant Universe Part 2: String's The Thing (5/5)

Episode 3
YouTube - The Elegant Universe 3: Welcome to the 11th Dimension (1/5)
YouTube - The Elegant Universe 3: Welcome to the 11th Dimension (2/5)
YouTube - The Elegant Universe 3: Welcome to the 11th Dimension (3/5)
YouTube - The Elegant Universe 3: Welcome to the 11th Dimension (4/5)
YouTube - The Elegant Universe 3: Welcome to the 11th Dimension (5/5)