I once read a theory which said that if you travel to the past, you can't remember your future. Why?
Well, when you travel to the past, everything goes backwards, right? The physical state of people regresses. Then, according to the theory, as their mind is part of their physical state, it also regresses, or rather, the information that is in their mind regresses. Therefore, a person who travels to the past would not be able to remember his future, he would not even realize that they have traveled to the past. Now disprovable or not, it's just a theory, but this one got me thinking and I asked myself: What if it were really not possible to transport information through time?