diff --git a/internet_collections.md b/internet_collections.md
index 280176a..439f0ad 100644
--- a/internet_collections.md
+++ b/internet_collections.md
@@ -51,7 +51,12 @@
     Rust, BlockChain<br>
 [用Go语言汇编计算fibonacci数列](https://zhuanlan.zhihu.com/p/138719668)<br>
 [Alynx Zhou](https://sh.alynx.one/)<br>
-
+[Clloz](https://www.clloz.com/)<br>
+    界面特别好看<br>
+[Core Dumped](https://coredumped.dev/)
+    Rust, VM, emacs<br>
+[倔强的程序员](https://www.zhihu.com/column/c_1313110231912726528)
+    编! 译! 原! 理!<br>
 
 ## YouTube 收集(没有账号, 这就是我的收藏夹)
 ### Code
@@ -69,8 +74,11 @@
 [stack-based virtual machine(6 episode)](https://www.youtube.com/watch?list=PLSiFUSQSRYAOFwfP-aMzXJlWKVyIuWfPU)
     and [register-based(13 episode)](https://youtu.be/cfPDeso3XwI)<br>
 [register virtual machine in rust, with memory visualization](https://youtu.be/_uAMo-bXI5g)<br>
-[tsoding virtual machine for Lisp, in C](https://www.youtube.com/watch?list=PLpM-Dvs8t0VY73ytTCQqgvgCWttV3m8LM)
-    [some notes](tsoding_bm)<br>
+[tsoding virtual machine in C](https://www.youtube.com/watch?list=PLpM-Dvs8t0VY73ytTCQqgvgCWttV3m8LM)
+    , [some notes](tsoding_bm)<br>
+[what if I try to malloc too much memory](https://youtu.be/Fq9chEBQMFE)<br>
+[fireship bitcoin](https://youtu.be/qF7dkrce-mQ)
+    大概是我见过最好的讲区块链的视频了, 除了...JS 啊啊啊<br>
 
 ### Minecraft Redstone Survival
 [Mojang & Minecraft 开始衰落了吗?](https://youtu.be/VKydXD6Lr20)<br>
@@ -81,9 +89,14 @@
     [on odysee(lbry)](https://odysee.com/@IceGuye)<br>
 
 
-## Wiki
+## Other
 [日月脏主 Wiki](https://moonboos.fandom.com/zh/wiki/%E6%98%8E%E6%9C%88%E5%BA%84%E4%B8%BB_Wiki)
     MC 技术区毒瘤!<br>
 [Python-5](https://en.wikipedia.org/wiki/Python_(missile))
     from [tsoding's first porth video](https://youtu.be/8QP2fDBIxjM),
     (he is using debian, 37:00 copilot xd)<br>
+
+<!--
+https://www.pixiv.net/users/57759368
+https://www.pixiv.net/users/2973809
+-->
diff --git a/org-html/about_showing_ip.html b/org-html/about_showing_ip.html
new file mode 100644
index 0000000..83d2ee9
--- /dev/null
+++ b/org-html/about_showing_ip.html
@@ -0,0 +1,275 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
+<head>
+<!-- 2022-07-18 一 14:13 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>这一天终于来了, B站显示 IP 属地</title>
+<meta name="generator" content="Org mode" />
+<meta name="author" content="dongdigua" />
+<style type="text/css">
+ <!--/*--><![CDATA[/*><!--*/
+  .title  { text-align: center;
+             margin-bottom: .2em; }
+  .subtitle { text-align: center;
+              font-size: medium;
+              font-weight: bold;
+              margin-top:0; }
+  .todo   { font-family: monospace; color: red; }
+  .done   { font-family: monospace; color: green; }
+  .priority { font-family: monospace; color: orange; }
+  .tag    { background-color: #eee; font-family: monospace;
+            padding: 2px; font-size: 80%; font-weight: normal; }
+  .timestamp { color: #bebebe; }
+  .timestamp-kwd { color: #5f9ea0; }
+  .org-right  { margin-left: auto; margin-right: 0px;  text-align: right; }
+  .org-left   { margin-left: 0px;  margin-right: auto; text-align: left; }
+  .org-center { margin-left: auto; margin-right: auto; text-align: center; }
+  .underline { text-decoration: underline; }
+  #postamble p, #preamble p { font-size: 90%; margin: .2em; }
+  p.verse { margin-left: 3%; }
+  pre {
+    border: 1px solid #ccc;
+    box-shadow: 3px 3px 3px #eee;
+    padding: 8pt;
+    font-family: monospace;
+    overflow: auto;
+    margin: 1.2em;
+  }
+  pre.src {
+    position: relative;
+    overflow: auto;
+    padding-top: 1.2em;
+  }
+  pre.src:before {
+    display: none;
+    position: absolute;
+    background-color: white;
+    top: -10px;
+    right: 10px;
+    padding: 3px;
+    border: 1px solid black;
+  }
+  pre.src:hover:before { display: inline; margin-top: 14px;}
+  /* Languages per Org manual */
+  pre.src-asymptote:before { content: 'Asymptote'; }
+  pre.src-awk:before { content: 'Awk'; }
+  pre.src-C:before { content: 'C'; }
+  /* pre.src-C++ doesn't work in CSS */
+  pre.src-clojure:before { content: 'Clojure'; }
+  pre.src-css:before { content: 'CSS'; }
+  pre.src-D:before { content: 'D'; }
+  pre.src-ditaa:before { content: 'ditaa'; }
+  pre.src-dot:before { content: 'Graphviz'; }
+  pre.src-calc:before { content: 'Emacs Calc'; }
+  pre.src-emacs-lisp:before { content: 'Emacs Lisp'; }
+  pre.src-fortran:before { content: 'Fortran'; }
+  pre.src-gnuplot:before { content: 'gnuplot'; }
+  pre.src-haskell:before { content: 'Haskell'; }
+  pre.src-hledger:before { content: 'hledger'; }
+  pre.src-java:before { content: 'Java'; }
+  pre.src-js:before { content: 'Javascript'; }
+  pre.src-latex:before { content: 'LaTeX'; }
+  pre.src-ledger:before { content: 'Ledger'; }
+  pre.src-lisp:before { content: 'Lisp'; }
+  pre.src-lilypond:before { content: 'Lilypond'; }
+  pre.src-lua:before { content: 'Lua'; }
+  pre.src-matlab:before { content: 'MATLAB'; }
+  pre.src-mscgen:before { content: 'Mscgen'; }
+  pre.src-ocaml:before { content: 'Objective Caml'; }
+  pre.src-octave:before { content: 'Octave'; }
+  pre.src-org:before { content: 'Org mode'; }
+  pre.src-oz:before { content: 'OZ'; }
+  pre.src-plantuml:before { content: 'Plantuml'; }
+  pre.src-processing:before { content: 'Processing.js'; }
+  pre.src-python:before { content: 'Python'; }
+  pre.src-R:before { content: 'R'; }
+  pre.src-ruby:before { content: 'Ruby'; }
+  pre.src-sass:before { content: 'Sass'; }
+  pre.src-scheme:before { content: 'Scheme'; }
+  pre.src-screen:before { content: 'Gnu Screen'; }
+  pre.src-sed:before { content: 'Sed'; }
+  pre.src-sh:before { content: 'shell'; }
+  pre.src-sql:before { content: 'SQL'; }
+  pre.src-sqlite:before { content: 'SQLite'; }
+  /* additional languages in org.el's org-babel-load-languages alist */
+  pre.src-forth:before { content: 'Forth'; }
+  pre.src-io:before { content: 'IO'; }
+  pre.src-J:before { content: 'J'; }
+  pre.src-makefile:before { content: 'Makefile'; }
+  pre.src-maxima:before { content: 'Maxima'; }
+  pre.src-perl:before { content: 'Perl'; }
+  pre.src-picolisp:before { content: 'Pico Lisp'; }
+  pre.src-scala:before { content: 'Scala'; }
+  pre.src-shell:before { content: 'Shell Script'; }
+  pre.src-ebnf2ps:before { content: 'ebfn2ps'; }
+  /* additional language identifiers per "defun org-babel-execute"
+       in ob-*.el */
+  pre.src-cpp:before  { content: 'C++'; }
+  pre.src-abc:before  { content: 'ABC'; }
+  pre.src-coq:before  { content: 'Coq'; }
+  pre.src-groovy:before  { content: 'Groovy'; }
+  /* additional language identifiers from org-babel-shell-names in
+     ob-shell.el: ob-shell is the only babel language using a lambda to put
+     the execution function name together. */
+  pre.src-bash:before  { content: 'bash'; }
+  pre.src-csh:before  { content: 'csh'; }
+  pre.src-ash:before  { content: 'ash'; }
+  pre.src-dash:before  { content: 'dash'; }
+  pre.src-ksh:before  { content: 'ksh'; }
+  pre.src-mksh:before  { content: 'mksh'; }
+  pre.src-posh:before  { content: 'posh'; }
+  /* Additional Emacs modes also supported by the LaTeX listings package */
+  pre.src-ada:before { content: 'Ada'; }
+  pre.src-asm:before { content: 'Assembler'; }
+  pre.src-caml:before { content: 'Caml'; }
+  pre.src-delphi:before { content: 'Delphi'; }
+  pre.src-html:before { content: 'HTML'; }
+  pre.src-idl:before { content: 'IDL'; }
+  pre.src-mercury:before { content: 'Mercury'; }
+  pre.src-metapost:before { content: 'MetaPost'; }
+  pre.src-modula-2:before { content: 'Modula-2'; }
+  pre.src-pascal:before { content: 'Pascal'; }
+  pre.src-ps:before { content: 'PostScript'; }
+  pre.src-prolog:before { content: 'Prolog'; }
+  pre.src-simula:before { content: 'Simula'; }
+  pre.src-tcl:before { content: 'tcl'; }
+  pre.src-tex:before { content: 'TeX'; }
+  pre.src-plain-tex:before { content: 'Plain TeX'; }
+  pre.src-verilog:before { content: 'Verilog'; }
+  pre.src-vhdl:before { content: 'VHDL'; }
+  pre.src-xml:before { content: 'XML'; }
+  pre.src-nxml:before { content: 'XML'; }
+  /* add a generic configuration mode; LaTeX export needs an additional
+     (add-to-list 'org-latex-listings-langs '(conf " ")) in .emacs */
+  pre.src-conf:before { content: 'Configuration File'; }
+
+  table { border-collapse:collapse; }
+  caption.t-above { caption-side: top; }
+  caption.t-bottom { caption-side: bottom; }
+  td, th { vertical-align:top;  }
+  th.org-right  { text-align: center;  }
+  th.org-left   { text-align: center;   }
+  th.org-center { text-align: center; }
+  td.org-right  { text-align: right;  }
+  td.org-left   { text-align: left;   }
+  td.org-center { text-align: center; }
+  dt { font-weight: bold; }
+  .footpara { display: inline; }
+  .footdef  { margin-bottom: 1em; }
+  .figure { padding: 1em; }
+  .figure p { text-align: center; }
+  .equation-container {
+    display: table;
+    text-align: center;
+    width: 100%;
+  }
+  .equation {
+    vertical-align: middle;
+  }
+  .equation-label {
+    display: table-cell;
+    text-align: right;
+    vertical-align: middle;
+  }
+  .inlinetask {
+    padding: 10px;
+    border: 2px solid gray;
+    margin: 10px;
+    background: #ffffcc;
+  }
+  #org-div-home-and-up
+   { text-align: right; font-size: 70%; white-space: nowrap; }
+  textarea { overflow-x: auto; }
+  .linenr { font-size: smaller }
+  .code-highlighted { background-color: #ffff00; }
+  .org-info-js_info-navigation { border-style: none; }
+  #org-info-js_console-label
+    { font-size: 10px; font-weight: bold; white-space: nowrap; }
+  .org-info-js_search-highlight
+    { background-color: #ffff00; color: #000000; font-weight: bold; }
+  .org-svg { width: 90%; }
+  /*]]>*/-->
+</style>
+<link rel='stylesheet' type='text/css' href='./../css/org-css.css' />
+<script type="text/javascript">
+// @license magnet:?xt=urn:btih:e95b018ef3580986a04669f1b5879592219e2a7a&dn=public-domain.txt Public Domain
+<!--/*--><![CDATA[/*><!--*/
+     function CodeHighlightOn(elem, id)
+     {
+       var target = document.getElementById(id);
+       if(null != target) {
+         elem.classList.add("code-highlighted");
+         target.classList.add("code-highlighted");
+       }
+     }
+     function CodeHighlightOff(elem, id)
+     {
+       var target = document.getElementById(id);
+       if(null != target) {
+         elem.classList.remove("code-highlighted");
+         target.classList.remove("code-highlighted");
+       }
+     }
+    /*]]>*///-->
+// @license-end
+</script>
+</head>
+<body>
+<div id="content">
+<h1 class="title">这一天终于来了, B站显示 IP 属地</h1>
+<div id="table-of-contents">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents">
+<ul>
+<li><a href="#orgf21c499">1. 我的看法</a></li>
+<li><a href="#org5172942">2. reference</a></li>
+</ul>
+</div>
+</div>
+<p>
+卸载吧&#x2026;
+</p>
+<div id="outline-container-orgf21c499" class="outline-2">
+<h2 id="orgf21c499"><span class="section-number-2">1</span> 我的看法</h2>
+<div class="outline-text-2" id="text-1">
+<p>
+这个事情真正要打击的那些 <b><b>诈骗/造假/海外势力</b></b>, 并不会受到影响,
+它们肯定会使用"虚拟专用网络"伪造IP.
+</p>
+
+<p>
+那些所谓的"翻车"博主, 大多数可能只是公司在国内, 却因为这件事被各大媒体揪出来.
+</p>
+
+<p>
+对于那些网络喷子, 这种事估计不会减少它们的言论, 反而会加重"地域黑"&#x2026;
+</p>
+
+<p>
+对于普通人, 大多数肯定是没什么影响, 也根本不在意,
+但是有些人, 只想公开自己想让别人看见的,
+那这种平台的强制行为确实会让TA们很不满.
+</p>
+</div>
+</div>
+
+
+<div id="outline-container-org5172942" class="outline-2">
+<h2 id="org5172942"><span class="section-number-2">2</span> reference</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+<a href="https://zhuanlan.zhihu.com/p/508234267">from zhihu</a>
+掰锝胃, 这个链接的截图在B站不到半小时就被删除了&#x2026;
+</p>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="author">Author: dongdigua</p>
+<p class="date">Created: 2022-07-18 一 14:13</p>
+</div>
+</body>
+</html>
diff --git a/org-html/cheatsheet.html b/org-html/cheatsheet.html
index ff1c6dc..1c650c8 100644
--- a/org-html/cheatsheet.html
+++ b/org-html/cheatsheet.html
@@ -3,7 +3,7 @@
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
 <head>
-<!-- 2022-07-13 三 19:36 -->
+<!-- 2022-07-18 一 14:13 -->
 <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
 <meta name="viewport" content="width=device-width, initial-scale=1" />
 <title>Editor Chaetsheet</title>
@@ -224,17 +224,18 @@
 <h2>Table of Contents</h2>
 <div id="text-table-of-contents">
 <ul>
-<li><a href="#org8bb7273">1. VIM</a>
+<li><a href="#orgd8c83ff">1. VIM</a>
 <ul>
-<li><a href="#org16cebe2">1.1. deletion</a></li>
-<li><a href="#org39e0434">1.2. movement</a></li>
-<li><a href="#org9c4afca">1.3. visual</a></li>
-<li><a href="#org7943bc5">1.4. file/split</a></li>
+<li><a href="#orgb78a180">1.1. deletion</a></li>
+<li><a href="#orgf74d90a">1.2. movement</a></li>
+<li><a href="#orgdc21f17">1.3. visual</a></li>
+<li><a href="#org3d1d243">1.4. file/split</a></li>
 </ul>
 </li>
-<li><a href="#org219c420">2. EMACS</a>
+<li><a href="#org7e64464">2. EMACS</a>
 <ul>
-<li><a href="#org44f4acb">2.1. org-mode</a></li>
+<li><a href="#org1a48a87">2.1. org-mode</a></li>
+<li><a href="#orgad86cf4">2.2. normal</a></li>
 </ul>
 </li>
 </ul>
@@ -242,12 +243,12 @@
 </div>
 
 
-<div id="outline-container-org8bb7273" class="outline-2">
-<h2 id="org8bb7273"><span class="section-number-2">1</span> VIM</h2>
+<div id="outline-container-orgd8c83ff" class="outline-2">
+<h2 id="orgd8c83ff"><span class="section-number-2">1</span> VIM</h2>
 <div class="outline-text-2" id="text-1">
 </div>
-<div id="outline-container-org16cebe2" class="outline-3">
-<h3 id="org16cebe2"><span class="section-number-3">1.1</span> deletion</h3>
+<div id="outline-container-orgb78a180" class="outline-3">
+<h3 id="orgb78a180"><span class="section-number-3">1.1</span> deletion</h3>
 <div class="outline-text-3" id="text-1-1">
 <table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
 
@@ -303,8 +304,8 @@
 </div>
 </div>
 
-<div id="outline-container-org39e0434" class="outline-3">
-<h3 id="org39e0434"><span class="section-number-3">1.2</span> movement</h3>
+<div id="outline-container-orgf74d90a" class="outline-3">
+<h3 id="orgf74d90a"><span class="section-number-3">1.2</span> movement</h3>
 <div class="outline-text-3" id="text-1-2">
 <table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
 
@@ -355,8 +356,10 @@
 </div>
 </div>
 
-<div id="outline-container-org9c4afca" class="outline-3">
-<h3 id="org9c4afca"><span class="section-number-3">1.3</span> visual</h3>
+
+
+<div id="outline-container-orgdc21f17" class="outline-3">
+<h3 id="orgdc21f17"><span class="section-number-3">1.3</span> visual</h3>
 <div class="outline-text-3" id="text-1-3">
 <table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
 
@@ -405,8 +408,8 @@
 </div>
 
 
-<div id="outline-container-org7943bc5" class="outline-3">
-<h3 id="org7943bc5"><span class="section-number-3">1.4</span> file/split</h3>
+<div id="outline-container-org3d1d243" class="outline-3">
+<h3 id="org3d1d243"><span class="section-number-3">1.4</span> file/split</h3>
 <div class="outline-text-3" id="text-1-4">
 <table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
 
@@ -450,12 +453,12 @@
 
 
 
-<div id="outline-container-org219c420" class="outline-2">
-<h2 id="org219c420"><span class="section-number-2">2</span> EMACS</h2>
+<div id="outline-container-org7e64464" class="outline-2">
+<h2 id="org7e64464"><span class="section-number-2">2</span> EMACS</h2>
 <div class="outline-text-2" id="text-2">
 </div>
-<div id="outline-container-org44f4acb" class="outline-3">
-<h3 id="org44f4acb"><span class="section-number-3">2.1</span> org-mode</h3>
+<div id="outline-container-org1a48a87" class="outline-3">
+<h3 id="org1a48a87"><span class="section-number-3">2.1</span> org-mode</h3>
 <div class="outline-text-3" id="text-2-1">
 <table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
 
@@ -487,6 +490,48 @@
 <td class="org-left">&#xa0;</td>
 </tr>
 
+<tr>
+<td class="org-left">&#xa0;</td>
+<td class="org-left">&#xa0;</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+
+<div id="outline-container-orgad86cf4" class="outline-3">
+<h3 id="orgad86cf4"><span class="section-number-3">2.2</span> normal</h3>
+<div class="outline-text-3" id="text-2-2">
+<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
+
+
+<colgroup>
+<col  class="org-left" />
+
+<col  class="org-left" />
+</colgroup>
+<thead>
+<tr>
+<th scope="col" class="org-left">key</th>
+<th scope="col" class="org-left">usage</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="org-left">C-s</td>
+<td class="org-left">搜索</td>
+</tr>
+
+<tr>
+<td class="org-left">M-%</td>
+<td class="org-left">替换</td>
+</tr>
+
+<tr>
+<td class="org-left">C-_</td>
+<td class="org-left"><a href="https://linuxtoy.org/archives/emacs-undo-tree.html">undo/redo</a></td>
+</tr>
+
 <tr>
 <td class="org-left">&#xa0;</td>
 <td class="org-left">&#xa0;</td>
@@ -499,7 +544,7 @@
 </div>
 <div id="postamble" class="status">
 <p class="author">Author: dongdigua</p>
-<p class="date">Created: 2022-07-13 三 19:36</p>
+<p class="date">Created: 2022-07-18 一 14:13</p>
 </div>
 </body>
 </html>
diff --git a/org/about_showing_ip.org b/org/about_showing_ip.org
new file mode 100644
index 0000000..62fa08a
--- /dev/null
+++ b/org/about_showing_ip.org
@@ -0,0 +1,19 @@
+#+TITLE: 这一天终于来了, B站显示 IP 属地
+
+卸载吧...
+* 我的看法
+这个事情真正要打击的那些 **诈骗/造假/海外势力**, 并不会受到影响,
+它们肯定会使用"虚拟专用网络"伪造IP.
+
+那些所谓的"翻车"博主, 大多数可能只是公司在国内, 却因为这件事被各大媒体揪出来.
+
+对于那些网络喷子, 这种事估计不会减少它们的言论, 反而会加重"地域黑"...
+
+对于普通人, 大多数肯定是没什么影响, 也根本不在意,
+但是有些人, 只想公开自己想让别人看见的,
+那这种平台的强制行为确实会让TA们很不满.
+
+
+* reference
+[[https://zhuanlan.zhihu.com/p/508234267][from zhihu]]
+掰锝胃, 这个链接的截图在B站不到半小时就被删除了...
diff --git a/tsoding_bm.md b/tsoding_bm.md
index 25d81de..f9174db 100644
--- a/tsoding_bm.md
+++ b/tsoding_bm.md
@@ -1,4 +1,15 @@
 # tsoding vm for lisp
+## [ebisp](https://youtu.be/vVjNyY2jkqg)
+- 1:39 "imagine dying because breathing stopped for gc"
+- 1:46 "If you want clickbait, you should not lie in your titles, you should be always technically correct"
+- 1:47 It still build after a year
+
+## [garbage collector](https://youtu.be/2JgEKEd3tw8)
+- 0:55 jim, a json library
+- 1:20 start making gc
+- 1:30 ohhhh
+### [mark/sweep gc in C++](https://youtu.be/RjFQA0C9fjY)
+
 ## [Day 1](https://youtu.be/0irYsCYuZws)
 - 0:15 LLVM?
 - 0:18 вm -- blyat machine
@@ -8,7 +19,8 @@
 - 2:20-2:35 fibonacci (where my fib.asm came from)
 - 2:40-2:55 dump in-memory program into/from file (how to implement this in rust?)
 - 4:11 succeed!
-[](https://github.com/tsoding/bm/tree/238612b4f1d300baa922e57a543ed75c153f3e40)
+
+[progress](https://github.com/tsoding/bm/tree/238612b4f1d300baa922e57a543ed75c153f3e40)
 
 ## [Day 2](https://youtu.be/9td67NTtNCg)
 - 2:00 jump lable 
@@ -25,3 +37,16 @@
 - 3:43 refer to forth
 - 4:00 step debug
 - 4:14 swap relative address like dup
+
+[progress](https://github.com/tsoding/bm/commits/master?after=6384b3d7e8364370a9a3eff348cc10ad0c0b51ae+1294&branch=master&qualified_name=refs%2Fheads%2Fmaster)
+
+## [Day 4](https://youtu.be/X7bSMKUgKVc) function call!!!
+- 0:30 how function call & ret works
+- 1:15 I left the industry(software engineering)
+<!-- 1:18
+"why you wear headphones on neck and not head?"
+"because my neck is part of my head"
+-->
+- 1:30 native call: alloc on heap!
+- 1:38 ???
+- 1:58 Makefile to build a particular file extension
