Most people have wondered if time travel is possible and if so how would it work?  From supercharged DeLoreans in Back To The Future and other movies and shows we have long wondered if this really could be possible.  One of the main well known issues in regards to the subject is called The Grandfather Paradox.  This wikipedia snippet explains:

the time traveler goes back in time and kills his grandfather before his grandfather meets his grandmother. As a result, the time traveler is never born. But, if he was never born, then he is unable to travel through time and kill his grandfather, which means the traveler would then be born after all, and so on.

Some think they have figured out how to work through this concept.  Find out how on page 2

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