The illusion of time and does it have an arrow?

I decided to continue on the subject of time on this post for it's such a rich source of philosophical ponder and paradoxes. Time is too complex term to be described as a line, line of historical events until the time stops into the moment you recon as the present. Humans have intuitive hunch, similar as described above, of the nature of the time, which is linked with consciousness. Yet when the concept of time is put under scientific though, interpretation of what time is or can be start to straggle.

Time is a good companion of scientific diagrams. When you have one scientific quantity on one axis of Cartesian plane, it's in many cases informative to have time on the other. Still nobody cannot exactly tell what is time. A moment which is passed before you could really get hold of it? Maybe a periodic function in which phase is the only thing that truly matters?

The more you stop and think about time the less it makes sense. Then after awhile you realize you've been thinking quite a long time.

After reading Etienne Klein's Conversations With the Sphinx book I truly realized how incredibly complex and irrational the concept of time is. Time seem so familiar and essential thing that it is hard to accept that there is not a "right" scientific way to picture time. Perhaps the most important issue about time is that some events suggest that time is irreversible and other suggest that it is reversible. In other words it's a battle of a line like, and universal and dynamic time. Surely it can't be both at the same time?

Entropy as far as I know points out the direction of time and suggest that there is only one way to go. Then again many quantum mechanical processes (like strong interaction) can occur "both ways" and entangled photons can somehow transfer information instantly, reacting as if they were liberated from the tides of time. One could state that time marches on and swings back and forth simultaneously.

The basic unit of time, second was originally defined by the earth's orbit period around the sun. Nowadays it's about "the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.1" So we have gone from huge macroscopic event to theoretical (since ground state means 0K) quantum mechanical event that is basically a matter of probability. These two cannot really be compared, still they both have posed as the ultimate description of nature.

Even though for us humans time seems to be lost for good once it's gone by in our macroscopic world, quantum physic suggest even that the time travelling could be possible someday. Well at least for a single particles according to Wheeler and Feynman. This following video will show you why this time travelling would be a very bad idea if it could be executed in a human scale: http://www.youtube.com/watch?v=75nBenOWul0