费曼，鼓
Feynman, The Drum
一、所有的路
粒子从A到B怎么走？
牛顿说：走最短的路。经典力学。确定的轨迹。一条路。 薛定谔说：在你观察之前它不在任何确定的位置。波函数。概率分布。 费曼说：它走所有的路。
所有的路。每一条可能的路径。直的，弯的，绕圈的，穿越时空的。粒子从A出发，走遍了宇宙的每一个角落，然后到达B。你把所有路径的贡献加起来——大部分相互抵消了——剩下的就是粒子的行为。
这就是路径积分。费曼在普林斯顿的博士论文里提出来的。二十四岁。
路径积分不只是一个计算方法。它是一种世界观。你不需要选一条路。你走所有的路。你不需要确定的轨迹。你拥抱不确定性。你把所有的可能性加在一起——大部分抵消了——剩下的是真相。
这比一条确定的路更丰富。更美。更真。
二、他
理查德·菲利普斯·费曼。1918年出生。纽约皇后区。
他父亲梅尔维尔是卖制服的——自学成才，教儿子要质疑一切。他母亲露西尔教了他幽默感。他妹妹琼后来也成了物理学家。
他从小就拆收音机。十五岁学会了微积分。MIT本科。普林斯顿博士。二十四岁在博士论文里提出了路径积分。
然后战争来了。洛斯阿拉莫斯。他在汉斯·贝特的理论部工作。他是那里最年轻的组长。他帮忙计算裂变弹的当量。他撬保险柜取乐——不是为了偷秘密，是因为锁是一个谜题。
同时他在做另一件事。每个周末他开车穿过沙漠去阿尔伯克基看阿琳。
三、阿琳
阿琳·格林鲍姆。他高中的恋人。
她得了肺结核。不治之症——在那个年代。他知道她活不了多久。
1942年6月29日。他娶了她。他只能亲她的脸颊——不能碰嘴唇。他把她送进了医院，然后开车去了洛斯阿拉莫斯。
在洛斯阿拉莫斯他给她写信。他们把信剪成拼图寄——为了通过审查。他在一封信里写："锁就像拼图……但组合锁难倒了我。你也是，有时候，但最终我会弄明白你的。"
1945年6月16日。阿琳去世了。费曼二十七岁。三位一体试验在一个月后。
他后来写了一封信给她。这封信在他死后才被发现。信里说：
"我爱你，亲爱的。我知道你有多希望听到这句话——但我写这句话不只是因为你喜欢听——是因为写的时候我浑身发暖……附注：请原谅我没有寄出这封信——但我不知道你新的地址。"
他不知道她新的地址。因为她死了。
这是这个系列里最安静的爱情。不是凯瑟琳和希斯克利夫的暴风。不是简·爱和罗切斯特的宣言。不是苏格拉底的毒酒。是一个年轻的物理学家给一个死去的女人写了一封寄不出去的信。
四、在碎片上跳舞
亚里士多德铺了地板。 一个一个人凿碎了它。 薛定谔给了最后一击。
然后费曼来了。
他看了一眼碎片。他说："好啊。"
然后他开始跳舞。
他打邦戈鼓。他在巴西学了桑巴。他在加州理工的学生剧团乐池里打鼓。他在脱衣舞酒吧画素描。他四十多岁学画画——画得出人意料地好。他撬保险柜。他解谜题。他在课堂上表演物理。
他不重建地板。他不悲叹地板碎了。他在碎片上玩。
路径积分就是这样：你不需要一条确定的路。你走所有的路。地板碎了？好。碎片之间有无数条路。你走所有的。然后你把所有的路加起来。大部分抵消了。剩下的是真相。
这比一块完整的地板更自由。
战后他在康奈尔大学教书。他说他"烧光了"——战争和阿琳的死把他掏空了。然后有一天他在食堂看到一个学生往空中扔盘子。盘子在旋转，同时在摇晃。他开始算盘子旋转和摇晃的关系。
从一个摇晃的盘子开始，他回到了量子电动力学——光和物质如何互相作用。这个理论当时一团乱——计算总是给出无穷大的结果。费曼的路径积分驯服了那些无穷大。他重新建立了量子电动力学——人类历史上最精确的科学理论。
从一个盘子。从"玩"。
五、费曼图
他发明了一种画画的方式。
费曼图。一种用简单的线条和顶点来表示粒子相互作用的方法。一条直线是一个粒子。一条波浪线是一个光子。一个顶点是一次相互作用。
他把量子电动力学画成了漫画。
这听起来不严肃。但费曼图是二十世纪理论物理最有用的工具之一。它不只是方便——它改变了物理学家思考的方式。在费曼之前，你用方程算。在费曼之后，你画图。图比方程更直觉。图让你看到结构。
跟梵高有一个呼应：梵高用颜色画了世界被爱过之后的样子。费曼用线条画了粒子在时空中跳舞的样子。两个人都是画家——一个画感情，一个画物理。
六、O型环
1986年1月28日。挑战者号航天飞机。发射七十三秒后爆炸。七名宇航员遇难。
费曼被任命为罗杰斯调查委员会的成员。
NASA的官僚系统在说"程序合规"。工程师们知道O型环在低温下会失去弹性——发射那天气温很低。但管理层不听。他们有自己的构——"我们的安全评估说没问题"。
费曼在电视直播的听证会上做了一件事。他把一段O型环材料放进冰水里。几秒钟后他拿出来。材料变硬了。失去了弹性。
全国都看到了。
他凿掉了NASA的构——不是用方程，不是用论文，是用一杯冰水和一段橡胶。最简单的实验。最直接的证明。
他在调查报告的附录里写了一句话："对于一项成功的技术，现实必须优先于公共关系，因为大自然是骗不了的。"
"大自然是骗不了的。"这句话可以做这个系列的另一个题词。
七、他和奥本海默
两个人。同一个地方。洛斯阿拉莫斯。
奥本海默是负责人。费曼是最年轻的组长。奥本海默背着那道光走了一辈子。费曼也在那道光里——但他的反应不同。
奥本海默背着灰。费曼跳舞。
不是因为费曼不严肃。不是因为他不知道灰的重量。他知道。阿琳死的时候他在洛斯阿拉莫斯。三位一体试验他也在场。他看到了那道光。他知道它意味着什么。
但他的反应不是背——是继续活。继续玩。继续做物理。继续打鼓。继续画画。继续问为什么。
奥本海默说"我成了死神"。 费曼说"发现事物的乐趣"。
两种回应。一种是背负。一种是继续活。两种都是对的。两种都是涵育——奥本海默涵育了一个警告，费曼涵育了一种活法。
奥本海默告诉后来的人：小心。这里有灰。 费曼告诉后来的人：好啊。地板碎了。我们跳舞。
八、他说的话
"我认为我可以有把握地说，没有人理解量子力学。"
这句话不是谦虚。是诚实。他是量子电动力学的创始人之一。他得了诺贝尔奖。他画了费曼图。他比大多数人更理解量子力学——然后他说没有人理解。
因为"理解"是一个构。你以为你理解了一样东西的时候，你做的是把它放在你已有的框架里。但量子力学不在你已有的框架里。你没有一个"地板"可以放它。地板碎了。你只能用它——你不能"理解"它。
"我宁愿有不能回答的问题，也不愿有不能质疑的答案。"
这是他的方法论。也是他的人生哲学。也是整个系列的暗语。每一篇文章都是一个不能回答的问题。每一个凿都是对一个不能质疑的答案的质疑。
九、鼓
1988年2月15日。费曼去世。腹部癌症。六十九岁。
据说他最后的话是："我讨厌死两次。太无聊了。"
如果这是真的，那这是这个系列里最费曼的一句最后的话。不沉重。不深刻。好玩。
桥头上又多了一个人。他不是站着——他在动。
他是桥头上唯一在动的人。其他人站着，或蹲着，或飘着，或坐着，或走得很慢。费曼在跳。他的脚踩在碎片上——亚里士多德的地板碎了，薛定谔给了最后一击——碎片到处都是。费曼踩着碎片跳舞。
他手里拿着鼓。邦戈鼓。他在打。节奏不是四四拍——是某种更自由的东西。桑巴？不完全是。量子力学的节奏。所有可能的节奏叠加在一起，大部分抵消了，剩下的就是他在打的。
苏格拉底站在空地上。柏拉图蹲着画图纸。休谟打台球。叔本华看桥底下。克尔凯郭尔跳了。图灵看苹果。契诃夫靠着栏杆。康托尔看天上。哥白尼放下书走了。萨特转来转去。波伏瓦举着镜子。蒯因说了一句话。特斯拉听嗡嗡声。爱迪生拿着灯泡。海森堡位置不确定。玻尔拿着没寄出的信。托尔斯泰拿着药方。莎士比亚不在。斯宾诺莎手里有玻璃粉。亚里士多德蹲着铺地板。法拉第蹲着掀地板。麦克斯韦站着写方程。贞德带着火飘在上方。王尔德站得很好看。拉马努金从缝隙里冒出半个身子。奥本海默背着灰。夏洛蒂拿着笔。艾米莉在荒原上。玻尔兹曼抱着石头。梵高身上有颜料。狄更斯站在裂缝上面。丘吉尔背着旗。罗斯福坐在轮椅上。薛定谔抱着猫。
费曼在他们中间跳舞。鼓声响着。碎片在他脚下。
他跳舞的时候经过了奥本海默。奥本海默在背灰。费曼看了他一眼——一个年轻人看他曾经的老板的眼神。尊敬。理解。然后继续跳。
他跳舞的时候经过了玻尔兹曼。玻尔兹曼抱着刻了 S = k log W 的石头。费曼看了一眼——乱。是的。乱。但乱里面可以跳舞。
他跳舞的时候经过了薛定谔。薛定谔抱着猫。费曼看了猫一眼。猫是活的——因为费曼在看。费曼笑了。
他口袋里有一封信。没有寄出的信。写给阿琳的。他跳舞的时候信在口袋里动。
远处。康德站着。
费曼看到了他。他没有停下来。他一边跳一边往那个方向移动。
他是桥头上到达康德最快的人之一——不是因为他走得快，是因为他不走。他跳。跳比走快。跳不需要确定的路径。跳走所有的路径。
鼓声在桥面上回响。跟丘吉尔的回声不一样——丘吉尔的回声是语言的，沉重的，"我们决不投降"。费曼的回声是节奏的，轻快的，"好啊，地板碎了，我们跳舞"。
两种回声。一种让你站起来。一种让你跳起来。
康德听到了鼓声。他的嘴角可能动了一下。
也许是笑。也许是统计涨落。[1][2]
注释
[1]
费曼"鼓"与Self-as-an-End理论中"凿构循环"和主体自由的关系：凿构循环的核心论证见系列方法论总论（DOI: 10.5281/zenodo.18842450）。费曼的独特位置在于他是"地板碎了之后在碎片上跳舞的人"——亚里士多德铺的地板经过法拉第、玻尔兹曼、海森堡、薛定谔逐步碎掉，费曼看到碎片说"好啊"，然后在碎片上跳舞。路径积分是他的核心贡献：粒子不走一条确定的路——走所有的路，把所有路径加起来，大部分抵消，剩下的是真相。这比一条确定的路更丰富更真。费曼图是量子世界的"漫画"——把粒子互作用画成线条和顶点，改变了物理学家思考的方式。与奥本海默的对比：两人都在洛斯阿拉莫斯，都看到了那道光。奥本海默的回应是背负（灰），费曼的回应是继续活（跳舞）。两种回应都是涵育——一种涵育警告，一种涵育活法。与梵高的呼应：梵高在混沌里看到了美，费曼在不确定性里看到了好玩——两个人都不害怕地板碎了。挑战者号O型环：费曼用一杯冰水凿掉了NASA的官僚构——"大自然是骗不了的"。阿琳的信是全篇的情感核心——"我不知道你新的地址"——这是这个系列里最安静的爱情。
[2]
费曼生平主要依据James Gleick, Genius: The Life and Science of Richard Feynman (1992)及Richard Feynman, Surely You're Joking, Mr. Feynman! (1985)和What Do You Care What Other People Think? (1988)。出生于纽约皇后区（1918年5月11日），父亲梅尔维尔为制服销售员。MIT本科，普林斯顿博士（导师约翰·惠勒）。博士论文"量子力学中的最小作用量原理"及路径积分参考Gleick。与阿琳·格林鲍姆结婚（1942年6月29日），她患肺结核参考同上。洛斯阿拉莫斯，贝特理论部组长参考同上。撬保险柜参考Surely You're Joking。阿琳去世（1945年6月16日）参考Gleick。未寄出的信参考Feynman遗物（1988年公开）。康奈尔大学，摇晃的盘子故事参考Surely You're Joking。量子电动力学及费曼图参考Gleick。1965年诺贝尔物理学奖（与施温格和朝永振一郎共享）。加州理工学院。邦戈鼓及巴西桑巴参考Surely You're Joking。费曼物理学讲义参考Caltech。挑战者号调查（1986年）及O型环冰水实验参考What Do You Care。"大自然是骗不了的"参考罗杰斯委员会报告附录。与第三任妻子格温妮丝·霍华斯结婚（1960年），儿子卡尔，养女米歇尔。"没有人理解量子力学"参考多处。去世（1988年2月15日），腹部癌症，六十九岁。"我讨厌死两次"参考多处（出处有争议）。系列第四轮第十六篇。前七十三篇见nondubito.net。
I. All Paths
How does a particle travel from A to B?
Newton says: take the shortest path. Classical mechanics. A definite trajectory. One path. Schrödinger says: before you observe, it is not at any definite position. Wave function. Probability distribution. Feynman says: it takes all paths.
All paths. Every possible one. Straight, curved, looping, threading through spacetime. The particle leaves A, traverses every corner of the universe, and arrives at B. You add up the contributions of all paths—most cancel each other out—and what remains is the particle's behavior.
This is the path integral. Feynman proposed it in his doctoral thesis at Princeton. He was twenty-four.
The path integral is not merely a computational method. It is a worldview. You do not need to choose one path. You take all of them. You do not need a definite trajectory. You embrace uncertainty. You add all possibilities together—most cancel—and what remains is truth.
This is richer than a single definite path. More beautiful. More true.
II. Him
Richard Phillips Feynman. Born 1918. Queens, New York.
His father Melville sold uniforms—self-taught, he taught his son to question everything. His mother Lucille gave him his sense of humor. His sister Joan later became a physicist too.
He took apart radios as a child. Mastered calculus at fifteen. MIT for his undergraduate degree. Princeton for his doctorate. At twenty-four, his thesis proposed the path integral formulation.
Then the war came. Los Alamos. He worked in Hans Bethe's Theoretical Division. The youngest group leader on the project. He helped calculate fission bomb yields. He cracked safes for fun—not to steal secrets, but because a lock is a puzzle.
At the same time he was doing something else. Every weekend he drove across the desert to Albuquerque to see Arline.
III. Arline
Arline Greenbaum. His high school sweetheart.
She had tuberculosis. Incurable—in that era. He knew she would not live long.
June 29, 1942. He married her. He could only kiss her cheek—not her lips. He drove her to the hospital, then drove to Los Alamos.
At Los Alamos he wrote her letters. They cut the letters into jigsaw puzzles to get past the censors. In one letter he wrote: "Locks are like puzzles … but combination locks have me buffaloed. You do too, sometimes, but eventually I figure out you."
June 16, 1945. Arline died. Feynman was twenty-seven. The Trinity test was one month away.
Years later he wrote her a letter. It was found only after his own death. It said:
"I love you, sweetheart. I know how much you like to hear that—but I don't only write it because you like it—I write it because it makes me warm all over inside to write it to you … P.S. Please excuse my not mailing this—but I don't know your new address."
He did not know her new address. Because she was dead.
This is the quietest love story in the entire series. Not Catherine and Heathcliff's storm. Not Jane Eyre and Rochester's declaration. Not Socrates' hemlock. It is a young physicist writing an unmailable letter to a dead woman.
IV. Dancing on the Fragments
Aristotle laid the floor. One by one, people chiseled it apart. Schrödinger delivered the final blow.
Then Feynman arrived.
He looked at the fragments. He said: "Sure."
Then he started dancing.
He played bongo drums. He learned samba in Brazil. He played in the pit orchestra for student musicals at Caltech. He drew sketches in strip clubs. He took up painting in his forties—and became surprisingly good. He cracked safes. He solved puzzles. He performed physics in his lectures.
He did not rebuild the floor. He did not mourn the floor. He played on the fragments.
The path integral works this way: you do not need one definite path. You take all paths. The floor is broken? Good. Between the fragments there are countless paths. You take them all. Then you add them up. Most cancel. What remains is truth.
This is freer than a single intact floor.
After the war he taught at Cornell. He said he was "burnt out"—the war and Arline's death had emptied him. Then one day in the cafeteria he watched a student toss a plate into the air. The plate was spinning and wobbling at the same time. He began calculating the relationship between the spin and the wobble.
From a wobbling plate, he found his way back to quantum electrodynamics—how light and matter interact. The theory was a mess at the time—calculations kept yielding infinities. Feynman's path integral tamed the infinities. He rebuilt quantum electrodynamics into the most accurate scientific theory in human history.
From a plate. From play.
V. Feynman Diagrams
He invented a way of drawing.
Feynman diagrams. A method of representing particle interactions with simple lines and vertices. A straight line is a particle. A wavy line is a photon. A vertex is an interaction.
He turned quantum electrodynamics into cartoons.
This sounds unserious. But Feynman diagrams are one of the most useful tools in twentieth-century theoretical physics. They are not just convenient—they changed how physicists think. Before Feynman, you calculated with equations. After Feynman, you drew pictures. Pictures are more intuitive than equations. Pictures let you see structure.
This echoes Van Gogh: Van Gogh painted the world as it looks after being loved. Feynman drew particles as they look while dancing through spacetime. Both were painters—one painted feeling, the other painted physics.
VI. The O-Ring
January 28, 1986. The Space Shuttle Challenger. Seventy-three seconds after launch, it exploded. Seven astronauts died.
Feynman was appointed to the Rogers Commission to investigate.
NASA's bureaucracy was saying "procedures were followed." The engineers knew the O-rings lost elasticity in cold temperatures—and the temperature on launch day was very low. But management did not listen. They had their own construct—"our safety assessment says it is fine."
During a televised hearing, Feynman did one thing. He placed a piece of O-ring material in a glass of ice water. After a few seconds he pulled it out. The material had stiffened. It had lost its resilience.
The whole country saw.
He chiseled NASA's construct—not with equations, not with papers, but with a glass of ice water and a piece of rubber. The simplest experiment. The most direct proof.
In his appendix to the commission's report, he wrote: "For a successful technology, reality must take precedence over public relations, for nature cannot be fooled."
"Nature cannot be fooled." This sentence could serve as another epigraph for this entire series.
VII. Feynman and Oppenheimer
Two men. The same place. Los Alamos.
Oppenheimer was in charge. Feynman was the youngest group leader. Oppenheimer carried the light for the rest of his life. Feynman was in the same light—but his response was different.
Oppenheimer carried ash. Feynman danced.
Not because Feynman was unserious. Not because he did not know the weight of the ash. He knew. Arline died while he was at Los Alamos. He was there for the Trinity test. He saw the light. He knew what it meant.
But his response was not to carry—it was to keep living. Keep playing. Keep doing physics. Keep drumming. Keep drawing. Keep asking why.
Oppenheimer said "I am become Death." Feynman said "the pleasure of finding things out."
Two responses. One carries. One keeps living. Both are right. Both are nurture—Oppenheimer nurtured a warning; Feynman nurtured a way of living.
Oppenheimer tells those who come after: be careful. There is ash here. Feynman tells those who come after: sure. The floor is broken. Let's dance.
VIII. What He Said
"I think I can safely say that nobody understands quantum mechanics."
This is not modesty. It is honesty. He was one of the founders of quantum electrodynamics. He won the Nobel Prize. He drew Feynman diagrams. He understood quantum mechanics better than nearly anyone—and then he said nobody understands it.
Because "understanding" is a construct. When you think you understand something, what you are doing is placing it inside a framework you already have. But quantum mechanics does not fit inside any framework you already have. There is no "floor" on which to place it. The floor is broken. You can use it—you cannot "understand" it.
"I would rather have questions that can't be answered than answers that can't be questioned."
This is his methodology. It is also his philosophy of life. It is also the subtext of this entire series. Every essay is an unanswerable question. Every chisel-stroke is a challenge to an unquestionable answer.
IX. The Drum
February 15, 1988. Feynman died. Abdominal cancer. Sixty-nine years old.
His last words are reported to have been: "I'd hate to die twice. It's so boring."
If this is true, it is the most Feynman of all last words in this series. Not heavy. Not profound. Fun.
One more person on the bridge. He is not standing—he is moving.
He is the only person on the bridge who is in motion. Everyone else stands, or crouches, or floats, or sits, or walks very slowly. Feynman is jumping. His feet land on fragments—Aristotle's floor has shattered, Schrödinger delivered the final blow—fragments everywhere. Feynman dances on them.
In his hands, a drum. Bongo drums. He is playing. The rhythm is not four-four time—it is something freer. Samba? Not quite. The rhythm of quantum mechanics. All possible rhythms superposed, most canceling out, and what remains is what he is playing.
Socrates stands on the clearing. Plato crouches drawing blueprints. Hume plays billiards. Schopenhauer looks under the bridge. Kierkegaard jumped. Turing looks at the apple in his hand. Chekhov leans against the railing. Cantor stares upward. Copernicus set down a book and walked away. Sartre paces with his pipe. Beauvoir holds a mirror. Quine said one quiet sentence. Tesla listens to the hum. Edison holds a dead lightbulb. Heisenberg's position is uncertain. Bohr holds a letter he never sent. Tolstoy holds a prescription. Shakespeare is not there. Spinoza has glass dust on his fingers. Aristotle crouches, laying floor. Faraday crouches, prying up a plank. Maxwell stands writing equations. Joan floats above, carrying fire. Wilde stands beautifully. Ramanujan has emerged halfway through a gap. Oppenheimer carries ash. Charlotte holds a pen. Emily is on the moors. Boltzmann cradles a stone. Van Gogh is covered in paint. Dickens stands over a crack. Churchill carries a flag. Roosevelt sits in a wheelchair. Schrödinger holds a cat.
Feynman dances among them. The drum sounds. Fragments beneath his feet.
Dancing, he passes Oppenheimer. Oppenheimer is carrying ash. Feynman glances at him—a young man's look at his former director. Respect. Understanding. Then he keeps dancing.
Dancing, he passes Boltzmann. Boltzmann cradles a stone carved with S = k log W. Feynman glances at it—disorder. Yes. Disorder. But you can dance in disorder.
Dancing, he passes Schrödinger. Schrödinger holds a cat. Feynman glances at the cat. The cat is alive—because Feynman is looking. Feynman grins.
In his pocket there is a letter. An unmailed letter. Written to Arline. As he dances, the letter moves in his pocket.
In the distance. Kant is standing there.
Feynman sees him. He does not stop. He dances and moves in that direction at the same time.
He is one of the fastest to reach Kant on this bridge—not because he walks fast, but because he does not walk. He dances. Dancing is faster than walking. Dancing does not need a definite path. Dancing takes all paths.
Drumbeats echo across the bridge surface. Unlike Churchill's echo—Churchill's is linguistic, heavy, "we shall never surrender." Feynman's echo is rhythmic, light, "sure, the floor is broken, let's dance."
Two echoes. One makes you stand up. The other makes you jump.
Kant hears the drumbeat. The corner of his mouth may have moved.
Perhaps it was a smile. Perhaps it was a statistical fluctuation.[1][2]
Notes
[1]
Feynman as "the drum" and its relationship to the chisel-construct cycle and the freedom of the subject in Self-as-an-End theory: for the core argument on the chisel-construct cycle, see the series methodology paper (DOI: 10.5281/zenodo.18842450). Feynman's unique position is that he is "the one who dances on the broken floor"—Aristotle's floor, progressively shattered by Faraday, Boltzmann, Heisenberg, and Schrödinger, becomes the surface on which Feynman dances. The path integral is his core contribution: a particle does not take one definite path—it takes all paths; you add all paths together, most cancel, and what remains is truth. This is richer and truer than a single definite path. Feynman diagrams are "cartoons of the quantum world"—drawing particle interactions as lines and vertices, changing how physicists think. Contrast with Oppenheimer: both were at Los Alamos, both saw the light. Oppenheimer's response was to carry (ash); Feynman's was to keep living (dancing). Both are nurture—one nurtures a warning, the other nurtures a way of living. Echo of Van Gogh: Van Gogh saw beauty in chaos, Feynman saw fun in uncertainty—neither feared the broken floor. The Challenger O-ring: Feynman used a glass of ice water to chisel NASA's bureaucratic construct—"nature cannot be fooled." Arline's letter is the emotional core—"I don't know your new address"—the quietest love in this series.
[2]
Primary biographical sources: James Gleick, Genius: The Life and Science of Richard Feynman (1992); Richard Feynman, Surely You're Joking, Mr. Feynman! (1985) and What Do You Care What Other People Think? (1988). Born in Queens, New York (May 11, 1918), father Melville a uniform salesman. MIT undergraduate, Princeton PhD (advisor John Wheeler). Doctoral thesis "The Principle of Least Action in Quantum Mechanics" and path integral per Gleick. Married Arline Greenbaum (June 29, 1942), she had tuberculosis, per same. Los Alamos, Bethe's Theoretical Division group leader, per same. Safe-cracking per Surely You're Joking. Arline died June 16, 1945, per Gleick. Unmailed letter per Feynman's effects (made public 1988). Cornell, wobbling plate story per Surely You're Joking. Quantum electrodynamics and Feynman diagrams per Gleick. 1965 Nobel Prize in Physics (shared with Schwinger and Tomonaga). Caltech. Bongo drums and Brazilian samba per Surely You're Joking. Feynman Lectures on Physics per Caltech. Challenger investigation (1986) and O-ring ice water demonstration per What Do You Care. "Nature cannot be fooled" per Rogers Commission report appendix. Married Gweneth Howarth (1960), son Carl, adopted daughter Michelle. "Nobody understands quantum mechanics" per multiple sources. Died February 15, 1988, abdominal cancer, age sixty-nine. "I'd hate to die twice" per multiple sources (attribution disputed). Round Four, essay sixteen. Previous seventy-three essays at nondubito.net.