Keep in mind everything is possible to an extent, if it's tangible, it's possible (physically), and if it's intangible, it still possible (in the wonderful world of perception and thought).
Instead of telling them it's impossible, perhaps we could explain how it is possible.
First off, Zebrah is right, if you couldn't time travel, we'd all be stuck, and that isn't happening anytime soon.
Secondly, what Zebrah speaks of is just the present, or what is *now*. I'd like to elaborate on the earlier mentioned, "not physically possible"... The concept of time travel is typically thinking about hopping in a some funny looking, poorly built machine, and shooting through some random wormhole created in the fabric of space just by pushing a little button. It doesn't physically work that way. However, as with anything, time travel can be experience simply through thought, and visualization. People talk all the time about "past life regressions", well if it's from the past, then the knowledge and experience of it somehow made its way here. In this example, a person will access memories that do not currently belong to their physical existence and use them to piece together what it could have been like before the last time they "died".
This is time travel. It is the very concept that a person uses to imagine a time they didn't experience physically.
It could also be simple memories from your childhood. Every time you think back, your mind is shooting through the tangible space of your subconcious and observing a time that is long passed.
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