>>Exactly.. They’ve proven matter can travel forward, but not backward.<<
So, you can kill your grandchild but not your grandfather, thus avoiding paradox? ;)
There will have to be a new movie.. “Forward to the Past” ;)
You want a nice paradox? A 25 year old guy meets a scientist who sends him 26 years back in time - he meets a 26 year old woman, has a one night stand and comes back to the future. He gets into a car accident and at the hospital he is found to have both male and female parts. Too badly damaged to be restored as a male, they restore him as a female. She goes back to the scientist and goes back in time, meets “himself” for their one night stand, stays there, has the baby, puts the baby in an orphanage, and goes back to the future. The baby, 25 years later meets a scientist who sends him back in time...
This individual is his/her own mother and father.
Wrap your head around THAT paradox and tell me where this persons DNA originated.