Well, even now, we are leaving marks in the timeline. The posts and letters we write, the causes we push for. The world records. This is as close to non-tech immortality as we ever get. Knowing that I did something, even if no one was able to see it--is now part of the timeline--for whatever that is worth...a good life is its own reward.
I did like that commerical with the old man.
"Grandpa--where do we go when we die?"