So for those of you who have played Mass Effect 2, you know that Commander Shepard, at the beginning of the game, was thrown from her ship (I say her because mine was female) and into space, where her suit suffered a leak and she died from asphyxiation and exposure to the vacuum of space. Her body was recovered by Cerberus and repaired, her memories and personality remained intact. She wakes up ready to kick alien ass (like literally, first thing you do is grab a pistol and shoot down mechs) and is tested to prove that her memories are intact.
Given that the body is nothing more than an extremely complex system of chemical reactions, do you believe that such a thing is possible, that, if we had sufficient knowledge on how our bodies worked, that one day we could actually bring life to those who have died? To rebuild and repair them, like they are an organic machine? Will such technologies ever exist?
And if such a thing ever becomes possible, here's the real question, would their memories and personality be intact, or would they be someone new and different?
As to my personal belief, I think it is possible. Life is just a chemical reaction and the only reason it is so hard for us to recreate it is because of how complex it is. I cannot say whether bringing someone back from the dead would keep their memories and personalities intact however, for I do not know how the brain encodes such things.
*Note that I am only using ME2 as an example, so there is no need to limit yourself to the ME2 universe.