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Closed timelike curve is the jargon for time travel. It means you go out, come back and meet yourself in the past.

"Kip Thorne: physicist studying time travel tapped for Hollywood film" by Rory Carroll, www.theguardian.com. June 21, 2013.
Closed timelike curve is the jargon for time travel. It means you go out, come back and meet yourself in the past.