http://news.nationalgeographic.com/news/2011/04/110427-time-travel-not-possible-physics-big-bang-space-science/
Read it. Get a headache.
I would like to know how they think they can extrapolate their 'toy' big bang to the real thing. But the idea of local entropy being reversed is intriguing. Although I'd note one thing. Is our perception of time a product of our own aging? If entropy was reversed, would we really notice? They talk about the old science fiction cliche of time turning around and people aging younger. I don't see how that could be possible.
It's like matter and anti-matter. Anti-matter is whichever one you aren't.
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