格致

黑板用完后，再次使用前就得擦。黑板是即时交流用的，不是为记录。即使使用过程中，上面的内容也会被不停地改写，删除，和更新。但是 1931 年，爱因斯坦到牛津做演讲，那时他已经是国际知名人士了。在一次报告后，他用的一块黑板被保存起来，现在成为牛津科学史博物馆的宝贝。

2005 年初，为纪念狭义相对论百周年，该博物馆邀请了英国一些知名人士，让他们在同样尺寸的黑板上写点什么画点什么。所有这些黑板都被保存下来，现在就成了一个展览。黑板正迅速从会议、课堂和演讲中消失，所以他们的展览叫：“Bye Bye Blackboard”。

这就是爱因斯坦当初留下的黑板内容。据说这些公式是解释宇宙膨胀的一个简单模型。

author: Abraham Pais asin: 0192806726 binding: Paperback list price: $24.95 USD amazon price: $22.46 USD

Subtle is the Lord is widely recognized as the definitive scientific biography of Albert Einstein. The late Abraham Pais was a distinguished physicist turned historian who knew Einstein both professionally and personally in the last years of his life. His biography combines a profound understanding of Einstein's work with personal recollections from their years of acquaintance, illuminating the man through the development of his scientific thought. Pais examines the formulation of Einstein's theories of relativity, his work on Brownian motion, and his response to quantum theory with authority and precision. The profound transformation Einstein's ideas effected on the physics of the turn of the century is here laid out for the serious reader. Pais also fills many gaps in what we know of Einstein's life - his interest in philosophy, his concern with Jewish destiny, and his opinions of great figures from Newton to Freud. This remarkable volume, written by a physicist who mingled in Einstein's scientific circle, forms a timeless and classic biography of the towering figure of twentieth-century science.

土摩托，是个科学记者，他最新帖子里有这样一段话：

量子物理理论预言，所有的粒子都像一朵浮云，找不出确定的轨迹。可是，相对论却并不这么认为，在相对论看来，世界是决定了的，所有的物理公式都应该板上钉钉，不存在不确定性。

有趣的是，量子力学的浮云理论和相对论的决定论其实都是爱因斯坦创立的。他老人家到了晚年终于明白过来了：原来自己干了一辈子就是为这个世界发明了两种完全相反的理论，这怎么行？这个世界应该是统一的，他要找出一个终极理论，统一这个世界。可是，一直到死，他老人家都没能解决这个问题。