I have a proposal for a time travel model that does not involve paradoxes:
What if time machines rearrange the matter of the entire universe to look exactly like it was some time ago? i.e. If somebody else used a time machine, you and the whole world will go back in time. That way, nothing in...
Something terribly wrong is about the parallel universes theory: it exists simply to explain time travel, but you DONT need to explain: time travel doesn't exist at all. Making up a hypothesis (that multiple universes exist) just to support another hypothesis (that time travel is possible)...
I was discussing this topic with my friend, and reached this conclusion:
Time travel is impossible because of three reasons:
1. You cannot be dead and alive at the same time (unless you're the cat in the box)
If time machines exist, they can surely send video signals back in time...
I think that friction is electrostatic interactions at a very small scale. Electrostatic interactions are conservative, but tons of them aren't if you treat it as a whole. For example, in a whole pool of positive charges like this:
+++++++++++++++++++++++++++++++++++
a "grid" of positive ions...
I was thinking of a kind of teleporter common in science fiction: the door that when you enter, you pop out somewhere else. This kind of teleporter violates the first law of thermodynamics!
Energy cannot be destroyed or created. If we put two teleporting doors like this...