Earlier quoted context omitted.
> but unfortunately that isn't possible. You know information is never truly destroyed. Bringing Dr. Sagan back will probably remain too difficult for a couple generations, but, eventually, we'll figure that one out. And I can imagine the look on his face.
Even if you collected all the atoms that made up a person's brain, the most important information is lost. For starters, how would you know how those atoms were configured?
But, like I said, it's a problem to be solved by our smarter successors, not for us.