Life after death?
I don't believe in life after death, but we can be sure about life before death. Time and space are treated in a unified way in relativity theory. Things that have happened are as real as things that are happening now, or as things that are happening in a far away galaxy, or things that have yet to happen. So, Einstein is alive and well, but unfortunately for us, we can't interact with him. Similarly, no one living in the year 3000 is able to talk to us. They may be able to learn something about us by studying or bodies, though. They may think of ourselves as dead bodies, but they are wrong; we are alive and well in the year 2005.