置信区间理论提供了一种不同于点估计和假设检验的估计未知参数的方法。
水太清了就会见不到鱼，人太精明了就没有朋友。冠冕的玉旒，是用来遮蔽视线；用丝棉塞耳，是为了减弱听觉。
In computing, turning the obvious into the useful is a living definition of the word "frustration".
"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."
The very shaping of history now outpaces the ability of men to orient themselves in accordance with cherished values. And which values? Even when they do not panic, men often sense that older ways of feeling and thinking have collapsed and that newer beginnings are ambiguous to the point of moral stasis.
The discovery of topological insulators has opened up a new frontier in condensed matter physics, where the interplay of symmetry and topology leads to novel quantum states of matter.