Time travel missing on Twitter

WASHINGTON (AP) -- Researchers with perhaps a bit too much time on their hands conducted an extensive Internet and social media search for evidence of time travelers. And they came up empty.

No real life Dr. Who or Marty McFly from "Back to the Future" going back in history and then bragging about it online.

Spurred by idle chat during Thursday poker games, astrophysicist Robert Nemiroff and his students at Michigan Technological University searched for mentions of Pope Francis and Comet ISON before they popped into reality.

The idea was that if Pope Francis was mentioned in a 2011 tweet, Facebook post or blog item, then time travelers must have come back from the future with special knowledge.

The empty results will be presented Tuesday at the American Astronomical Society meeting

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