Susskind的书让我无法入睡，因为他写得太精彩了，这是我读过的最好的没有公式的书！尤其是第二章开头的那个故事。推荐所有读过这个帖子的人掏银子买下这本书，还有什么比大牛用精彩的文笔科普最前沿的理论更激动人心呢？

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摘抄一段Susskind对Cosmological Constant的看法：

Theoretical physicists and observational cosmologists regarded this problem(cosmological constant) differently. The traditional cosmologists have generally kept an open mind about the possibility that there may be a tiny cosmological constant. In the spirit of experimental scientists, they have regarded it as a parameter to be measured. The physicists, myself included, looked at the absurdity of the required coincidence and said to themselves(and each other) that there must be some deep hidden mathematical reason why the cosmological constant must be exactly zero. This seemed more likely than a numerical cancellation of 119 decimal places for no good reason. We have sought after such an explanation for almost half a century with no luck. String theorists are a special breed of theoretical physicist with very strong opinions about this problem. The theory that they work on has often produced unexpected mathematical miracles, perfect cancellations for deep and mysterious reasons. Their view (and it was, until not too long ago, also my view) has been that String Theory is such a special theory that it must be the one true theory of nature. And being true, it must have some profound mathematical reason for the supposed fact that the vacuum energy is exactly zero. Finding the reason has been regarded as the biggest, most important, and most difficult problem of modern physics. No other phenomenon has puzzled physicists for as long as this one. Every attempt, be it in quantum field theory or in String Theory, has failed. It truly is the mother of all physics problems.