埃伦费斯特给爱因斯坦讲述了自己在量子理论方面的艰难探索，引得后者不禁同情地连连点头：“量子理论越成功，看起来就越荒唐。”

在 1913 年 6 月一个温暖的傍晚，爱因斯坦坐在瑞士苏黎世一间咖啡馆的花园里，面前的桌子上放着一个空杯子，身边两位是他一生的好朋友保罗·埃伦费斯特和马克斯·冯·劳厄（1879—1960）。

他们刚从一场学术讨论会出来，讨论会的是关于劳厄一年前在慕尼黑做出的激动人心的发现。劳厄发现，原子排列规则的蓝色硫酸铜晶体能使 X 射线发生衍射，也就是说，X 射线会像波一样穿过原子间的缝隙，在另一侧成扇形散开形成同心波纹。然后，这些不同缝隙的波纹之间会相互发生干涉，波峰与波峰（或波谷与波谷）相叠加形成振幅更大的波，或者，波谷抵消了波峰而使振幅减小。劳厄立即把实验结果的照片寄给了爱因斯坦，爱因斯坦则回信祝贺他所取得的了不起的成就，“你的实验是物理学迄今为止所见证的最精彩的事物之一”。但爱因斯坦的量子如何才能纳入这个图景，仍然是一个谜。

劳厄相貌堂堂、富有思想，并且为人正直——后来在纳粹统治的动乱期间也依然如此。劳厄的父亲曾是一位普鲁士军官，一生四处漂泊，这也使得劳厄的整个童年总是不断从一个城镇搬到另一个城镇，从一所学校转到另一所学校。1906年，劳厄在老师普朗克的介绍下首次接触到了刚发表不久的相对论。他顿时被相对论所吸引，决定在暑假专门前往瑞士伯尔尼的专利局，希望与其见上一面。见面之后，他惊讶地发现爱因斯坦年纪轻轻，恰与自己同岁。他们在回家途中边走边聊，爱因斯坦递给他一只雪茄，但雪茄闻着如此糟糕，劳厄“一不留神”让它掉进了河里。1911 年，劳厄出版了一本首次全面介绍相对论的教科书，爱因斯坦认可它是“一部小小的杰作”。

自从 1903 年在洛伦兹的课上首次接触到量子的概念，埃伦费斯特已经与量子打了很久的交道。虽然他常常受到抑郁症的困扰，但这通常会被他充沛的活力所掩盖，而他的真诚和杰出的评判能力则使他成为“物理学界的良知”。他不是一个传统的维也纳人，他娶了俄国物理学家塔季扬娜为妻，两人一起定居圣彼得堡。但在俄国革命前的混乱局势中，尽管他深爱着这个国家，却没有大学能够提供职位给他这样一个外国人、犹太人和无神论者。1912 年，正当他已经决定要搬到瑞士苏黎世以便更接近爱因斯坦时（劳厄在同一年已经这样做了），洛伦兹点名要他去莱顿大学继任自己的位置。在那里，他将为数以百计的来访物理学家创造出宾至如归的学术氛围，但自己却从来没有找到自在如家的感觉。他个子不高、肩膀宽阔，一双深陷的黑色眼睛在短而硬的黑发下炯炯有神。他有时会借用德语中的俗语，比如为了点明某个复杂科学概念的关键所在，他会说：“那正是青蛙入水的地方！”又或者为了向爱因斯坦致敬，他会说：“这是专利要求！”

在埃伦费斯特第一次与爱因斯坦见面之前，劳厄曾警告过他：“你要小心，别让爱因斯坦滔滔不绝，说个不停。他最喜欢这样。”不过，埃伦费斯特足以应付这件事。这是他们的第二次见面，其间埃伦费斯特和爱因斯坦曾在热气升腾的山间边走边聊，连续交谈了五天。而在几天前的爬山过程中，他们甩开同行的一帮物理学家走在了前面，爱因斯坦解释着自己的工作，埃伦费斯特则丢出一个个越来越尖锐的问题。当埃伦费斯特最终弄明白时，他欢欣鼓舞的喊声“我明白了”甚至传到了跟在后面的劳厄耳中。

现在在咖啡馆，埃伦费斯特给爱因斯坦讲述了自己在量子理论方面的艰难探索，引得后者不禁同情地连连点头：“量子理论越成功，看起来就越荒唐。”

埃伦费斯特转向劳厄，问道：“他跟你说过布拉格公园的故事吗？”

劳厄摇了摇头。

“唔，那是一年前我去布拉格第一次拜访爱因斯坦的时候——爱因斯坦，你来讲吧。”

“从我的办公室能看到一座漂亮的公园，有花有树，”爱因斯坦讲道，“人们到公园里来，一些人陷入沉思，其他人则成群地、激烈地比画着手势。”这时，爱因斯坦不由咧嘴笑了起来，说：“但奇怪的是，早上只有女人而晚上只有男人。当我问别人这是什么地方时，他们告诉我：‘这是波西米亚的精神病院！’”

埃伦费斯特又转向劳厄：“然后他说：‘那些是没研究量子理论的疯子。’”

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59, .6);--weui-TAG-BACKGROUND-ORANGE: rgba(250, 157, 59, .1);--weui-TAG-TEXT-GREEN: rgba(6, 174, 86, .6);--weui-TAG-BACKGROUND-GREEN: rgba(6, 174, 86, .1);--weui-TAG-TEXT-BLUE: rgba(16, 174, 255, .6);--weui-TAG-BACKGROUND-BLUE: rgba(16, 174, 255, .1);--weui-TAG-TEXT-BLACK: rgba(255, 255, 255, .5);--weui-TAG-BACKGROUND-BLACK: rgba(255, 255, 255, .05)}}@media(prefers-color-scheme:dark){.wx-root:not([data-weui-theme=light]),body:not([data-weui-theme=light]){--discussInput-BG: rgba(255, 255, 255, .03)}}@media(prefers-color-scheme:dark){.wx-root:not([data-weui-theme=light]),body:not([data-weui-theme=light]){--nickName-FG: #959595}}@media(prefers-color-scheme:dark){.wx-root:not([data-weui-theme=light]),body:not([data-weui-theme=light]){--weui-BG-0: #111;--weui-BG-1: #1e1e1e;--weui-BG-2: #191919;--weui-BG-3: #202020;--weui-BG-4: #404040;--weui-BG-5: #2c2c2c;--weui-FG-0: rgba(255, 255, 255, .8);--weui-FG-HALF: rgba(255, 255, 255, .6);--weui-FG-1: rgba(255, 255, 255, .5);--weui-FG-2: rgba(255, 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div.autoTypeSetting24psection > p,div.autoTypeSetting24psection > section{margin-bottom: 24px;}