Well, there is a theory of spacetime that everything that has or will or is happening exists simultaneously. So time paradoxes are impossible.
So, we may have discovered the Higgs boson, and then "nature" undid the discovery afterwards, by stopping it from being discovered in the first place. We'd never "know" that the Higgs boson had been discovered, but it WAS discovered. We just don't have access to that event in spacetime.
Yeah, it's nutty. But the physics all work out.
Ahhh common ignornace.
Your location on the globe (what your countries laws are) and what type of material you are dealing with (print, versus audio, versus other artwork) play into the length of copyright.
Just because Disney has fucked up your country doesn't mean those rules apply to anyone else.
You see but you do not observe. Sir Arthur Conan Doyle, in "The Memoirs of Sherlock Holmes"