The first rule

"NO REAL LIFE MARTY MCFLY? Researchers have found no evidence of time travelers, such as Marty McFly from the Back to the Future movie franchise, bragging about their exploits online.

Time travellers, if they really exist, seem to be keeping their adventures to themselves.

Researchers with perhaps a bit too much time on their hands conducted an extensive internet and social media search for evidence of time travellers going back in history and then bragging about it online.

And they came up empty. No real life Dr Who or Marty McFly from the movie "Back to the Future" tweeting secrets a bit early.

Spurred by idle chat during Thursday poker games, an astrophysicist and his students at Michigan Technological University in Houghton, Michigan, searched for mentions of Pope Francis and Comet ISON - before they popped into reality. Francis was elected pope last March and ISON was first detected in September 2012.

The idea: If someone mentions a Pope Francis in a 2011 tweet, Facebook post or blog item, then they must have come back from the future with special knowledge.

But no one posted anything prescient…"

Cretins!!!

The first rule of time traveling is- NEVER admit you can time travel!