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What is according to you is the most interesting and fascinating concept/ theory in physics and Why ?

Have you ever related that concept to some ordinary stuff and wondered how everything is interconnected o__O ?
it can be more than one..
Thanks a lot =)

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    Apr 3 2012: there is so much i can't pick the winner. but here are two, one is more serious, other is not so much. but i won't tell which is which.

    there is a possibility that the world is like a surface of a sphere. if we look in one direction, we can see our own back. but it is nothing, here comes the crazy part. how do we actually test that hypothesis? because if we look far, we also look back in time. so if we spot our own galaxy like a billion light years away, we see it as it was a billion years ago. and we not necessarily recognize it. so it is quite possible that we actually see ourselves in the sky, and we don't even know it.

    the other one is the one electron hypothesis. there is a way to describe the positron (anti-electron) as an electron traveling backward in time. in that description, annihilation is a point at which the electron turned back from forward moving to backward moving. for us, the observers, it looks like a positron and an electron meeting and disappearing. in fact, what happened is that the electron came from the past, then turned back and left for the past, appearing as an anti-electron. and the crazy part: there is a cute explanation why all the electrons look the same. because there is only one electron in the universe. it travels back and forth in time, like a long spaghetti, all across the universe. its forward moving parts look like electrons, the backward moving parts look like positrons. the only problem with this theory is that we have more electrons than positrons. but this can be wrong, there might be positrons hidden somewhere, out of our watch. so we just need to find them.
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    Apr 4 2012: The Quasar dilemma.

    A study of 900 fast pulsing quasars has drawn some strange results,that quasars at 6 billion lys and quasars at 10 billion lys have no time dilation effect,in other words they defy hubbles law.Dr Michael Hawkins of the university of Edinburgh
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    R H

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    Apr 3 2012: I would say the multi-verse, or alternate universe theories, and the perception of outcome. I find these the most facinating because I'm interested in the human ability to discern, and why we have such divergent abilities to do so. For example, autistic and savant people have been known to demonstrate extraordinary abilities in some fields of study, mathematics for example, with no training. Mozart is renowned for his gifts of playing a complex score on the piano upon hearing it as a boy. Although science debunks the 'we only use 10%of the brain' theory, it seems obvious to me that we do not as of yet fully understand our ability to perceive. This, combined with current 'dimensional' exploration and theories of physics, leads me to wonder about the 'mystics' of history - those people who have claimed to perceive an alternate reality and/or universe. I see this as a possibility of convergence rather than mutually exclusive, and can only dream of the resulting resolution of conflicts for mankind.
  • Apr 3 2012: The infinite amount of space of the universe and the concept of time and aging
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    Apr 6 2012: the antropic principle
    The Laws of nature must be such, as we observe them, because if they were not, observers like us could not exist.