Duas notícias da revista
National Geografic
http://news.nationalgeographic.com/news/2005/09/0916_050916_timetravel.html

e

http://news.nationalgeographic.com/news/2004/03/0326_040326_briangreene.html

BBC
http://www.bbc.co.uk/science/space/exploration/timetravel/index.shtml

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