diff --git a/index.md b/index.md
index 658fd23..78da750 100644
--- a/index.md
+++ b/index.md
@@ -1,3 +1,7 @@
+<script src="https://fastly.jsdelivr.net/gh/stevenjoezhang/live2d-widget@latest/autoload.js"></script>
+<link rel="stylesheet" href="https://fastly.jsdelivr.net/npm/@fortawesome/fontawesome-free@6/css/all.min.css">
+
+
 ### Table of Contents (sorted by time)
 [build a nixos live image](nixos)<br>
 [moonboos, 懂的都懂](moonboos)<br>
diff --git a/org/internet_collections.org b/org/internet_collections.org
index 829c335..54bd6b8 100644
--- a/org/internet_collections.org
+++ b/org/internet_collections.org
@@ -195,13 +195,13 @@ java bad, python slow, nvidia fuck you, vi-sual studio, C艹 sucks
 2:14 "how many american server you have already hacked" - "I don't count them I'm sorry"
 *** [[https://youtu.be/Utse8P_L8k0][ArcaOS: Modern OS/2 ]]
 *** [[https://youtu.be/1z0ULvg_pW8][集线器，交换机和路由器的区别]]
-**** [[https://youtu.be/pCcJFdYNamc][Default Gateway Explained]]
 **** [[https://youtu.be/TIiQiw7fpsU][MAC Address Explained]]
 **** [[https://youtu.be/6_giEv20En0][Subnets vs VLANs]]
 *** [[https://youtu.be/UNkHditYGls][I coded a fractal on an Apple II+]]
+*** [[https://youtu.be/p8u_k2LIZyo][Fast Inverse Square Root — A Quake III Algorithm]]
+=0x5f3759df=
 
 ** Cyber Security
-*** [[https://youtube.be/TLa2VqcGGEQ][CVE-2021-3156 sudo]]
 *** [[https://youtu.be/x_R1DeZxGc0][Discover Vulnerabilities in Intel CPUs!]]
 *** [[https://youtu.be/2--1ph-4IaY][shit express hacked]]
 *** [[https://www.youtube.com/playlist?list=PL5--8gKSku15NSeLgrZX9hSEnqPTWoSJ0][DT: Privacy & Security]]
diff --git a/org/matrix.org b/org/matrix.org
index 0d4326c..5213447 100644
--- a/org/matrix.org
+++ b/org/matrix.org
@@ -18,7 +18,7 @@ but it don't work: https://github.com/alphapapa/ement.el/issues/77
 ** fractal
 HUGE and not fully fonctionall
 ** thunderbird
-HUGE, matrix support is not good: cannot show picture
+all-in-one solution, matrix support is not good: cannot show picture
 I even don't use it for email(I use Geary)
 
 * how to set proxy