There are 2 types of time travel and physicists agree that one of them is possible

Brian Greene, professor of physics and mathematics at Columbia University and co-founder of the World Science Festival, explains what we know about time travel so far. Following is a transcript of the video.


  1. Time is is always moving forward...time can NEVER flow backwards.
    The perceived rate of time movement is the so-called "time travel" mentioned here.
    Instead of 1 second for 1 would be perceived as being faster or slower...compared to the actual rate of 1-to-1.
    But that difference is only perceived by the individual experiencing the event that is effecting the 1-to-1 rate.
    For everyone else time flows normally.

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