That's just it though, there isn't anything we're completely certain about.AlkalineGamer said:This is pretty much the line i was talking about.
I'm fine with changing things we know little about.
But i don't think they can really change things we are completely certain about.
We can be reasonably sure of many things, but there are very few things that have been conclusively proven in all circumstances. The best example of that is the force of gravity. It hasn't actually been proven in all cases, especially at the quantum level (where essentially all of known physics gets thrown out the window).
Almost all of the physical sciences are like that. We can be reasonably sure that the information we do have is accurate and valid in all cases, but that has yet to be proven, so it's not unreasonable for something to completely violate whatever physical laws you'd like.
A halfway decent example from the real world is quantum teleportation. Someone just recently managed to send a stable particle. It's not unreasonable to state "Someday, we will know how to do this on a macro scale", and if you can do that you've basically broken Newtonian physics.