Time travelling

Have you ever wished things could be changed?

I caught myself quite a few times thinking "Oh if only I could turn back time a little bit" or "if I knew then what I know now" and think what the situation would be if I had said or done things in a different way.
Though mine was only a wish, some people did harbor the thought of time travelling and indeed change the past or take a look at the future.
Einstein's theory of relativity results from two statements -- the two basic postulates of special relativity:

1) The speed of light is the same for all observers, no matter what their relative speeds.
2) The laws of physics are the same in any inertial (non-accelerated) frame of reference. This means that the laws of physics observed by a hypothetical observer traveling with a relativistic particle must be the same as those observed by an observer who is stationary.

The first postulate, the speed of light will be seen to be the same relative to any observer, independent of the motion of the observer -- is the crucial idea that led Einstein to formulate his theory. It means we can define a quantity “c”, the speed of light, which is a fundamental constant of nature and it's how time is calculated too.

It all sounds quite omnious and very difficult but really what this means is that, according to this basis, we can suppose that to travel in time we just need to exceed the speed of light et voila’… it’s done!!!
But clever Mr Einstein had warned us that this would be impossible as nothing will ever travel faster than the speed of light...

During a recent study of the photon (a single particle of light) by some scientists in Hong Kong, this theory was proven right and therefore the idea of time travelling was definitively capped.
See, the probability of time travel is based on the possibility of exceeding the speed of light.
By correctly measuring the speed of a photon, and seeing that not even that could travel faster than light, we have exhausted any reason to explore time travelling... for the moment at least!

Knowing how men are (and thank goodness for their curious nature!) I don't doubt that sooner or later there will be some other attempt at figuring out time travelling... where else are we going to get inspiration for those incredible blockbuster Hollywood movies otherwise???