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I'm looking for a short story that I believe was written by Asimov back in the 50's or 60's. I read it in an anthology I checked out of the library back in the 80's or 90's. The story is like a stone skipping across time. At each point in time two characters play out the same situation of asking what is going to happen in the future. In each instance one person leaves the encounter to further the human race. In the last encounter as the last star in the universe is about to burn out the characters wonder what will happen next and then there is a big bang. Thanks for you help.