String Theory - Day 4

I did this research over the weekend because I'm not going to be able to Friday in class.  I primarily researched on branes.  First, Edward Witton (not sure of spelling) is the one who devised M-Theory.  Next, there are seperate dimensions, according to string theory, but we can not see them.  Branes are streched out strings which encompass dimensions.  Imagine a brane as a loaf of bread which holds our universe.  This may be the 4-brane because of the four dimensions we experience, 1time 3space.  This is where parallel universes may arise from.  The point is, strings give the structure for branes which holds dimensions.  Also, it is believed that the graviton, particle which holds gravity, comes from closed strings which do not latch onto any branes.  The strings move between the branes which spreads out the gravitons; thus, spreading out the force of gravity between dimensions.  This is why the force of gravity is so weak compared to Electro-magnetism, weak nuclear force (radiation), and strong nuclear force (atom kaboom).  Next, I think I maybe want to do how string theory relates to black holes.  I know I have Leonard Susskind on my side for that one!  Have a nice day! :)