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为什么在TCP协议中建立连接的握手需要三次？
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在任何一本计算机网络的教科书上，我们都会学到：应用程序在使用 TCP 通信之前，先要建立连接，而这个创建连接的过程被称为三次握手。（假如你已经忘了的话，我在文末写了段WireShark抓包实战：TCP连接的建立）接着，教材便会开始介绍三次握手的流程以及TCP报文段结构（TCP Segment Structure）。和喜欢追根溯源的历史故事不同，书本很少会涉及到一个问题：为什么在TCP协议中建立连接的握手需要三次？二次行不行？四次可以吗？“三”这个数字是怎么来的？与道家所讲的“一生二，二生三，三生万物”有关联吗？
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《Algorithms》摘录评注之叁：基本排序
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本节笔记将先介绍排序的API，再讲解数种常用的基本排序及具体实现，分别是：选择排序、插入排序以及Shellsort。目前在Shellsort中并没有一个严密的数学模型可以求得最优解，在这里介绍一个比较简单易用的：3x+1。
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《Algorithms》摘录评注之贰：栈和队列
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栈和队列是两种基本的数据结构类型，它们有不同的方式去对存储的数据进行操作。具体操作有：插入（push）、移除（pop）、迭代（iterate）以及检查是否为空等。两者的差别主要是数据的移动顺序。
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《Algorithms》摘录评注之壹：绪论
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本笔记基于ROBERT SEDGEWICK & KEVIN WAYNE开设的《Algorithms》课程，同时配有同名教材。slides本身内容丰富详实，所以我会先甄选出重点的篇幅整理出来并做简单批注，后续会添上对应算法题的演示。这是第壹篇笔记，让我们首先对算法有个直观的认识。
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势单一定力薄？且看13罗汉如何纵横8大平台成功开发Quip
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在一个小巧玲珑如麻雀的团队里开发产品，你要怎么做才能孵化出一只万众瞩目的凤凰？自从在Quora工作以来（以及最近在Quip的这些年），我一直在努力地思考这个问题。我是在Quora和Quip分别只有12人和13人的时候加入的。这两家初创企业都有雄心勃勃的使命。Quora致力于分享和增长全世界的知识，同时建造一座互联网上的“亚历山大图书馆”。在Quip，我们立志于打造出新一代的生产力工具，它能让每一家公司的每一个人在每一天使用起来都非常享受。
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缔造Instagram的这五年
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2015-10-29
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过去5年，我们的团队一直在（谢天谢地）成长和进步，我们坚持恪守我们的信条：简单的事情先做，它也是下一个五年计划的核心。在这里我将回顾从搭建Instagram起过去的五年时间里，其中一些最重大的里程碑事件——有好的，有坏的，还有出乎意料的。我希望这里的一些经验教训能帮你们打造自己的团队和公司，使其茁壮成长。
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