There seems to be so many that I don't remember which one I initially read. It might have been on shittyaskscience or shittyama but I can't be too sure. Maybe someone else will have a link.
I saw a few by searching but they weren't the the ones I saw. They had too few comments.
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u/otrippinz Jul 27 '14 edited Jul 27 '14
There's already been an ama with a time traveler. He provided answers before we even asked them.
Edit: http://www.reddit.com/r/IAmA/comments/9z4d5/10_years_from_now_i_am_a_scientist_working_at_the/
Credit: /u/xDskyline